This looks a good size space to be able to add more substance. I think having a Stug and four figures on a 35cm by 25cm base might look a bit sparse. Also good move to make it linkable to another base to expand if needed.
Question though; is this a response to the Miniart ‘diorama in a box’ products? Not the buildings a base sets but ones like Miniart 36066 (Caen 1944) and 36063 ( repair dio) which seem to have been popular but are hard to get.