Absolutely brilliant! I can't wait to see it all finished up. It's great to see the old b3 front end put to good use, too. Although in my experience, the old b/t3 front ends don't give you much in the way of adjustment. You only have 2 horizontally placed ball studs locations on the front tower which doesn't allow you to raise or lower your RC.
I raced my old t3 a couple times this summer after driving my mm4 dex210 for the winter and wished desperately I could convert it to mid motor. I may have to try something like this with my t3 now. curse you for planting ideas in my head!