You probably are already aware of these plans, but SJGames has one for the SDB. It's double-sided: one is hex, and the other is squares. Here's the link:
Suplement 7 Traders and Gunboats includes the deckplans for a 400T SDB. FASA's Adventure Class Ships Volume 1 has deck plans for 2 SDBs (Though both probably don't properly calculate under HG rev. 2 and one of them definitely doesn't.) However one is Zhodani.