First let me say that my T34 by Tamiya was one of the first kits I built. It went together easy, and was a fast build, BUT this kit is something like 30 years old. There were three main faults with the kit that I can see.
One: the tied downs on the fenders are molded on, and these will have to be cut off and replaced. I’m not sure if these will be included in you’re photo etched set or not, but wire will work great for it.
Two: the grills are all molded in plastic, but I do think eduard will save you there.
Three: and this is the one that bugs me the most, the first wheel on the tank is way too far back. On my kit it almost touches the first road wheel. Tamiya gives you an adjustable slot to mount this wheel and this is because the model was designed to be a working motorized toy. I would suggest putting this wheel as far forward as it will go. If you have some sort of reference to tell you how far forward it should go, I would highly advise you use it.
Having pointed out the flaws I must say that this 30+ year old kit is definitely one of those oldie, but goldies. And since it sounds like you have spent quite a bit of money making sure you can update this old kit I would suggest getting some sort of reference.
Here is the cheapest reference I know of. http://www.activevr.com/afv/1-35.html I’m also pretty sure you could find drawings on the internet somewhere else for free. Try a google search.
Hope there is something here you can use to help you. Good luck and have fun!!