Craftybug, your Irish Chain looks terrific! :thumbup:
The only thing I can say about matching your seams, is to make sure your seams are pressed in opposite directions. Then, when you are matching them, they will nestle together...and if you put them so the first one you come to when sewing is folded away from you, your presser foot will even push them together! (It usually works out that one goes away from you & the other goes toward you tho', but it seems like if the 1st one nestles, so will the 2nd one.)
Keep up the great work!! :D