The GURPS: Traveller Sulieman is proportioned differently from the Little Black Book version.
It's 2,455.6 m3 so it's WAY more than the 1,400 that 100 dTon should be; 175.4 dTon to be exact...
The good news is that the decks fit better, but the forward placement of the cabins means the forward, outboard corners are clipped to match the hull.
The volume of the interior spaces totals 1,030.7 m3 (207.3 + 788.5 + 34.9) or 73.6 dTon; which is close to the 80 dTon it's supposed to be...
I used the dimensions given in the SJ Games Traveller Deck Plan 5: Sulieman-Class Scout/Courier accessory because the plans shown on page 131 of GURPS: Traveller don't match the stats given.
It was rendering the deckplans in 3D solids that made me make what Erin called my dildo design; which came in at exactly 1,400 m3 or 100 dTon, just like the specifications require!
Left to right: GT, LBB and Dildo.