Nice work, brow,,, thanks for sharing ;)
About window flicker
I believe the problem is in the banner / window default file.
See how it is described in the BES mod and try to play it.
I tried inserting an original BES wheel / banner file, but it did not load. I Think Some note is missing, maybe in the .gen or Upgrades.ini file.
Fortunetly on track everythings seems to be fine.
Thanks for the review again!