Mark, there are screws thru the ends of the front radius rods that go thru the body into the side rails of the frame to hold the body on.
I'm not clear as to exactly which "screws" you're referring to: photo, perhaps?
Here is how it's (more or less) gonna look:
I was able to salvage the dashboard (steering wheel was missing) and had to cut off the actual "seat" part of that casting and shorten the back of the seat to clear the motor.
I'm not sure how I'm gonna integrate those rear axle "braces" (or whatever they are) into the final assembly; will probably ream out those currently square holes to allow the axle to pass through. Won't mess with that until longer axles show up...
Mark in Oregon