If you want a fast and agile and good rolling plane, choose Mig-21. I was a mechanic working with them during my service , and its unbelievable rugged and good to use. Outdated avionics and short legged but nevertheless.
Also as foamie it would be easy to make, just add some wings to a tube
Only bad point would be high wing loading due small fuselage and wings. Would be nice to make those ailerons to make work as flaps too to reduce landing speed (needs more than 4 ch radios to synch those???)
Tricycle landing gear with wide spacing = easy landing , also big wheels compared to size (made for russian unpaved RWYs )
And thing about that roll rate.... Delta wing with full moving elevators (no horizontal stab, whole assembly moves.) so no hinges..
I would love to have it in Finnish colors..