You most certainly can chain piece when PP. Get all the first peices ready, then sew them, snip apart, fold, flip, cut, iron.
Repeat with second piece. You have to be very organized 'cause you have to have all your fabric pre-cut and in the right order, but it can be done.
I prefer to make one block at a time. It just feels like more more is accomplished to me and I can put the blocks on the design board and see what I've done. This drives me to do the next block.
peace