One caution is that once certified as an aircraft, it may be difficult to
recertify it as a glider. So, if you think you may ever want it certified
as a glider, then do it with the original certification.

Colin N12HS

An Airplane and a Glider are both AIRCRAFT... so how do you intend to
certify it?

I think you meant to say, Airplane,, not Aircraft.. and yes.. once certified
one way, it is difficult to change...

BT