Sorry to bump this one from last month, but I really hope it's still coming along! It's definitely looking good tellis.
I got the same kit and (other than the paint) am at about the same point you are- though I really like that you're going to pop the lid on the engine compartment.
If you haven't found it, here's a page I found that has a lot of useful information. Wikipedia's got a few lines about it that say pretty much the same thing under their Hetzer page. As far as I can tell the Starr version just squeaked in by the end of the war, avoiding becoming another paper panzer by less than a dozen production vehicles, and a few even saw some combat(?) time during the uprise in Prague.
Czechoslovakia continued to produce Hetzers post war and exported a bunch to the Swiss who called them the G-13, not sure if those shared more in common with earlier Hetzers or the Starr though in terms of the recoil system...
Reading that reference page I posted, it sounds like the idea of rigidly mounting the gun to the frame and using the Hetzer with the breaks disengaged to absorb the recoil of the gun worked... but messed up the gunners hands pretty good if they were on the adjustment wheels and dislodged a lot of internal equipment, including breaking or vibrating the optics so much that it made follow up shots practically impossible.