Your last specs did not align with reality by a very, very long way. You aren't going to design a decent plane if you can't even do basic sanity checks.
Now it is going to be half the weight of a 140kg 66' span carbon honeycomb special? Still thinking you can fly fast in that? I can't see it even flying, myself.
You need to do some basic maths before making outrageous performance claims, or you will just get ridiculed.