Yep, and I have somewhere a couple of pictures of the Tiger barchetta it became in the early 70s. There's also a funny car that appeared in the French Retroviseur a few years ago claiming #009

It is the car illustrated it the "famous" book under 009 - strangely enough!
Was it you who wrote somewhere how remarkably kind the Sicilian climate is to old bodies and how they miraculously reappear in their old shape with all distinctive features (like airscoops etc) just a couple of inches away from their original location despite the original body having been destroyed in the early 1970's?
I'm not sure on what ground you identify LM #41 UD105338 with the later UD111833 #110. Close observation of the LM cars reveals details not to be found on any later car and the registrations from Fibreglass TZ1s were no longer used, so your hypothesis is well possible, but not to be drawn from the LM documentation.
From the info that I accumulated:
# 750110 used the registration number of # 750108 (Fiberglass TZ-1) UD105338 for the 1965 Le Mans race most probably for customs carnet reasons as # 750110 did not have its own registration yet at that time
# 750110 raced again in 1965 (Trento - Bordone), this time with the registration from Fiberglass TZ-1 # 750109 (UD105339) which had been crashed and destroyed by Jean Rolland in practice for the Nurburgring 1000 KM. For this purpose, # 750110 was ALSO stamped (not REstamped) # 750109 and still carries both numbers today.
After this race, # 750110 received its own registration UD111833 still in 1965
The double stamping lead Marcello Minerbi to wrongfully allocating this picture to # 750109 in his 1984 book:

(You don't expect a second number if you find 1...)
Incorrect as # 750109 was a Fiberglass TZ-1
Was it this error that gave rise to the idea that # 750109 had miraculously turned into a TZ-2 which has now surfaced in Hong-Kong (a.k.a. the Brussels of the Far East...

) after having been in hiding for nearly 30 years?
So far, I have only been able to link UD105338 to # 750108 and # 750110.
Absolute proof that # 41 is indeed # 750110? Nope... Will that ever come? I doubt it...
As always, I gladly stand corrected!
Have you ever contacted the ACO to see if we could draw from their files?
Here I cannot agree. Car #43 is #112, with the aluminium body, the prototype that raced at Monza and Targa Florio earlier, with Prova plates. Here (LM) it's registered UD100953 and is still painted orange, where the two new cars (fibre bodies) were red. Apart for the colour, an unique feature of #112 is the lack of wiper fairing, to be seen on the early pictures, at LM, and even today after restoration.
I guess you have a (very good!) point there.
Later pictures from when Alec Mildren ran the car in Australia also show the lack of wiper fairing...
I am still struggling to complete the picture of the 1965 Le Mans race...
I only have two color pictures of the # 42 & # 43 cars at Le Mans and they both look to be orange... could be that the color tone is off due to the age of the photos, scanner or monitor settings etc.:
# 42:

# 43:

According to my information, all TZ-2's were painted red for Le Mans...
During the race:

(is it me or does the hood appear to be "dented" under the "2" and above the grill? If so... aluminum hood?)
This picture shows the whole Alfa contingent lined up in the pits with at least # 42 & # 42 still lacking the extra cooling ducts shown in the race photo's above...
Your explanation for # 43 being # 750112 seems more than plausible which leaves the questions:
Is there a way to "fix" # 750110 to being # 41?
Which one is # 42?
BTW, # 43 (750112) raced at Le Mans with registration UD100953 which according to Ben Hendriks (1992) belonged to Fiberglass TZ-1 (I know you hate the TZ-1 name but I'll go with Doug Nye and use it as "retrospective nomenclature for the sake of clarity"

) # 750107... Again a customs matter?
I believe we all agree that the # 44 TZ-1 is # 750041 of Nicolas Koob

which also ran in the 1965 Spa 500 KM race along with the two Walker Day cars and in which Tony Hegbourne was killed (in # 750073?)?

In the background, the white # 51 (# 750041) of Nicolas Koob, the grayish car to the right should be # 50 (# 750036) of Gustave Gosselin and the remaining # 52 & # 53 being the two Walker Day cars (# 750073 & # 750053 respectively) of Tony Hegebourn and Boley Pittard, both with their distinctive 5-slot bonnets, missing moustaches and missing indicator lights...
# 52:

# 53:
# 750073 seems to be pretty clear given its history of being delivered through Alfa UK (bar its miraculous resurrection when it took part in the 2000 Targa Florio Revival after having been destroyed in 1965 after Hegbourne's accident...).
The other car, possibly # 750053, is more difficult as that one was apparently supplied new in Switzerland...
I also read about # 750043 possibly being the second Walker Day car... would you have more on that?
Zo, dat was weer een behoorlijke exercitie "Hoe moeilijk kan het zijn? Nou.. ZO moeilijk dus!" Dank u, Autodelta!

Patina: Roest, gezien door ogen van iemand met poetsfobie...