intriguing.
unfortunately, your timing couldn't be worse. there are a grand total of THREE of us that still
create mods left. senior modders with plenty of experience have all retired or moved onto other areas, especially our TMP era experts. one is a porter that just started to learn on scratch building ships to avoid problems, the second is a converter making TOS versions, and I'm basically the guy that brings existing mods into the shop, fixes errors, and resprays em (basically, I'm the guy from MAACO, if you get the joke)
that does not mean, however, that one of us would NOT try and tackle this class. this looks like it could be easily kitbashed from existing TMP's with only a minimum of scratch building required. this would mostly involve the miniaturized engineering hull and the torpedo pods section in a diagonal orthographic for clarity.
as for DIY? besides the lessons here, you must have a 3d modelling program, a converter for the format the game uses that is
old enough to both
work and be recognized by the game (the NIF format the game uses is being downgraded, possibly for retirement), AND an art program that can and still does use the TGA format, which may
also be obsoleted, soon.
you would also have to learn HOW to model your parts so that they look like how you envision them in your head. for some of us, it would take YEARS to figure it out
TMP era style is notoriously difficult to get to look correct even in stock style, and your ship appears to be an 'era x' transition type with its hybrid refit/Excelsior nacelles and what appears to be out-of-era commillated phaser strips. some parts of the lineart would have to be clarified as to their purpose; it's kinda thick with a reduced resolution in the plan view.
all that said, however, doesn't mean it couldn't be done.