Okay, to answer loophole's question I would say that if you're just touching up the toy, but it's still essentially the same toy/character/incarnation, then yeah it counts. So your modified Universe Sunstreaker and Sideswipe would count. But if you're going to kitbash them into a substantially different toy/character/incarnation, then it wouldn't count.

Many of us touch up toys here and there. I've touched up a lot of worn out chrome on some of my G1 toys with mithral silver paint. Your touch-ups are just a lot more extensive () - but it's fundamentally the same principle.

e.g.: I don't count my G1 Sentinel Prime toy - a repaint of a G1 Rodimus Prime figure.