The dilligent version had the tank slung underneath the main mounting point - not above. https://www.wcnews.com/ships2/wc1diligent.shtml
It's also neat that you took so much of the detail of my high-res model. Kinda cool to see. Looks pretty good... I dunno what'd going on with that ventral fin, though...I don't recall seeing that anywhere.
roger that on the tank. as for the base of the fin, that's a game necessity. that's where the drayman's laser goes, and the laser(since its not cubic) needs a base.
according to the drawing, two more laser cannons go on the engines, but the tro shows only one gun
anyways, your model was a great inspiration, howie!
err, no the engines are not in the draymans wing. if you click the image larger, you'll see that those engines are the stern of a bengal carrier, that just happens to be behind the drayman