Hi Dan,
I paused a while, until I finished mine, too. But please proceed, you'll be happy to have such a big piece of metal in your stock! (And as far as I remember you're quite close to finish)
@Brett:
I don't have castacout at hand, but I don't recommend to roughen the tanks surface to much! In fact the components weren't cast, but rolled steel and welded. So the surface wasn't that rough. And as someone pointed out before, yes they were welded, but the weldlines were by far not as prominent as on other tanks, so don't overdo it here. The available pics show very delicate weldlines if at all.
As far as reference pics are concerned, the posted link is the best you'll be able to find. I don't think any book will provide more! And by the way, many books tend to 'over-rule' T-35 features (like 'mod. 38 hatch') as there were less than 70(!) tanks build at all (in 6 years!), so one can talk about an individual construction instead of industrial production.
Volker