Interconnecting ailerons does not lessen the loads. Aileron loads do not cancel out - they add. Draw the force diagrams.
Full size (puddle jumpers) interconnect ailerons for the simple reason that they have to connect somewhere - there's only one control stick. Models do not have this restriction - you can have two servos, one for each aileron. This also applies to big airplanes with hydraulic controls.
Good enough for full size is a dangerous engineering principle. Models and full size have significant differences in their physics in addition to design compromises needed to accomodate the fact that there is real live person on-board.
Thick trailing edges - see earlier comments - suit yourself. Seems to me the TE thickness on full size is a structural limitation. The minimum is twice the skin thickness plus a stiffener. Most PJ's I've seen it's about 1/4" - well that's pretty sharp on a 30ft wing. Thickest I've seen lately is the flap TE on a Lancair, which looked a bit odd because the flap TE was thick and the aileron TE was very sharp. I've asked but no-one yet has provided a plausible explanation for this asymmetry.