I'm curious why everybody thinks that big men are so horrible to train in outside skills. My 6'8'' (203 cm) SF had 2 passing pops in three weeks of training. I don't know how it works with 7' guys but they have the advantage in the inside skills. Plus the most expensive PG in the world is also 6'8'' tall (so I've been told), try it and see how it works.
Single position training or 2 position?
203 is no big man. I trained a 208cm, which is still not that tall, in both OD and JR (when there was no defensive switch) and I can tell you it's a pain. For a 22-23 yo, it took me 5 weeks to pop in OD and 4 weeks JR + 3 weeks JS for a pop in JR.