The electronics fit in the TT fine, it’s designed to be light, easy to transport and forgiving. Use the recommended parts and it will be a good flyer with a little incidence added to the wing, put a 1mm shim on the leading edge where it sits on the fuselage.
You can scale up as above, if it’s your first build I would get the speedbuild kit, it saves time and comes with all the other parts you need like contol wires and horns. Be sure you have spare power pods and props ready, whatever size you build it, as you will break those leaning.