Welp, ordered:
- a 3D printer so I can make the mold and alignment plate for the engine mount
- machining services for the aluminum inserts
- high strength studs with allen key head
- liquid polyurethane mix 80A durometer
So I'll just make my own engine mount soon. Basically, I'll be able to attach each metal insert to the top and bottom of the mold, so it's in exactly the position it's supposed to be, then pour in the polyurethane through the openings.