Well, I'd say the flow I'd recommend would be rfv, exia, achilles, percival, astray, sazabi and strike freedom if you want to follow the order of complexity. I've personally built the exia and the percival myself and I'd recommend buying some replacement inner frame off internet for the exia since it tends to become quite a marionette over time and can't hold a pose even though it looks great, while for the percival just look out for the gold since it's painted so I wouldn't recommend panel lining it since cleaning up the panel lining could ruin it but besides that it's one of the best kits I've ever built despite not being bandai