Re,
I registered to Scorpion Engine patreon today, just to support the author and the product. I'm not sure I'll use it for a real project but anyway I played a bit with the example projects and readed the docs, it seems to be a solid tool. Maybe I'll try to make something with it if I can find the time to. :)
Yes the A1200 with Fast-RAM is about twice as fast a stock config with Chip-RAM only. Or we can say the stock A1200 is twice as slow as it should have been. :)
About WinUAE I think the emulation is pretty accurate and it's easy to pick an Amiga model (hardware + software) to mimics. WinUAE is a powerful tool for developers either for building, testing or debugging programs. You should give it a try one day. ;-)
I can't wait to see how your game will elvole and I'll certainly keep playing with it and report my founds if any. :)