Sorry to chime in on this so late but I love the idea of G0-T0 having Sentry Droids - like "he" does on "his" yacht - helping him out if the HK-51's are there. In addition, you mentioned finding a mod to change the Sentry Droids appearance. Have you seen this?
http://knightsoftheoldrepublic.filefront.com/file/The_New_Goto;101367
I think this mod might change G0-T0 too so that should kept in mind. Also, you could always contact the original maker to see if it could included in your mod.
One final note on using G0-T0 clones: you would finally be able to use the cut line that says: "I shall have to remember some of his traits when I build future generations from his schematics." Instead of referencing HK-47 as was probably originally intended, now it could now be used on G0-To's Yacht in regards to Sentry Droid Mark I. You'd have to copy that line from the Malachor V modules to his yacht but that's child's play for you guys. Of course, if you use that mod listed or just simply reskin the "G0-T0 Clones", I would suggest renaming them as "Sentry Droids, Mark II"