RE: BYA Update
I found all of my websites by using google. Not much there, a few museum pics to help with some of the detail help you might want to pursue. There were hard and soft edge camo paint schemes and the ambush too. There were only 18 built so your options online are pretty scarce. Books are a far better resource but only you can decide what will help. The kit comes with 2 different counterweights to choose from and even some Sturms were built without it. The front additional armor plate is an option and was not used on all versions.
The fun part is deciding on how to secure the superstructure and attaching the main gun elevation inside. I utilized the Tamiya TI's part for this but wish I had used a servo.
It's all part of the fun!
Jeff