Jerry, What engine are you planning to use for the 801? If I'm not mistaken the 801 and 640 share the same firewall. Any chance of pooling resources?
C Smith

The engine will be either a 13B or a Renesis.   One thing you can do
is take advantage of Paul's engine mount drawings when they are published.
It would be nice if the 801 and the 640 shared "exactly"
the same engine mounts.  Unlikely unless they share the same firewall to
prop flange distance.  I would be interested in comparing the
plans.  Let's keep in touch.    Jerry

I believe that is the case. The 640 and the 801 empty weight and useful load
are almost identical, and they share the same gear. I'll ask the factory to
verify this, and let you know what they have to say.
Unfortunately, I'll probably be using one of the rotamax engines, so that
would be a completely different cat to skin.
I have a complete set of plans for the 640. If you need to see any
particular details let me know.
C Smith

Can you scan the firewall area Craig and email the jpg?