Glad to be here!
Yes it is Tamiya's
I also only bought the kit to tow my 88mm in a diorama.
It is very easy to build the Sd.kfz.7,but as it is so basic it does need all the aftermarket help it can get.
I used the modelkasten track and wheel kit which has metal sprockets
and is excellent
I also used the Eduard PE kit which is quite basic compared to todays sets but is very good as the kit floor has no tread plate.Also added AFV Clubs fender poles. I thinned down the mudguards and the chassis sides as they are so thick. I added foil cover for the seats as the originals have no detail.
I only bought the kit to tow my 88mm
It is very easy to build the Sd.kfz.7 as it is so basic.
hope this helps
cheers.