Hi Rhade I have my doubts about the existence of that variant, I saw a photo on internet that could be fake or simply someone found it practical to transport a Renault 35 chassis and a T-26 tower in the same train car, also add that modifying the chassis of a vehicle with a smaller ring than the tower to be installed is quite complex and requires mayor work, in addition to issues such as weight, balance and internal space, I do not doubt that it was an idea but I doubt that someone carried it out, (scale models are not a reference either) well those are my reasons for not including it, perhaps in Alternate Universe section.
There are 2 know photos of such conversion, of course lack of sources create reasonable doubts. But I did research that photo years ago and had the same conclusions as Will Kerrs, there is no signs of 'shop on it or it is done in very professional way that it is indistinguishable from original. Germans did put much heavier and larger structures on 35 series, T-26 turret would be rather easy work comparing to some of the conversions. The turret could also be permanently mounted in this position, it would not require any changes to the ring. There is a lot of questions about this conversion, but I do believe there is enough evidence to point to its actual existence. Even if questions, who, when, why and how, remain unanswered.
EDIT: https://tanks-encyclopedia.com/ww2/nazi ... 6_turm.php
I presume you also know about peculiar Lorraine modification with Panzer I turret?