It sounds like he will eat quite a few different solids. Have you ever tried beans? I just ask because my dd loves them and I was surprised.
He's about what my dd weighs..19 lbs at 11 mos and she is definitely plump enough (not fat but def. not skinny). She nurses very often (4-5 x/noc, 5-8 x/ day) but I really don't see that as a problem. The advice of only 2-3 nursings/day at this age seems rather low to me.
Best wishes, sorry I didn't contribute much. Each baby is different.