Rather than make the adapter and flywheel from scratch, buy a setup that works as you will be much farther ahead in time and $. It's comparatively easy to make the plate between the engine and trans but it is more difficult to get the flywheel, clutch and starter correct.

When making the adapter plate, you need to work from the crankshaft centerline on the engine and trans. Things must be aligned on the 0.005" or less of an inch range so a tape measure won't work here.