I'm not doing the SBCL parts, that's all Charles' work that I hired him for. My work is the portability bits that Trial relies on to do whatever and the general build architecture for this, along with the initial runtime stubbing.
My current unannounced project is a lot more ambitious still, being a 3D hack & slash action game. I post updates about that on the Patreon if you're interested.
And, as mentioned, *her :)