Sam,
Re. your comments about 3D printing/parts etc. and R.E.D.'s reply - this isn't as simple as it looks as I and another forum member are finding out first hand. There is a HUGE learning curve in both designing the parts and secondly either printing them yourself, or getting them printed by another party. I'm not trying to dissuade you, simply giving you the facts - it's not a simple a, b, c, we're done type of approach. This technology is still in its infancy and there is a vast arrray of programs & products out there that will entice you with their "claims" - realize that just like any other tool, 3D has its own set of "rules" and restrictions as to how to get from design to part.
My involvement is also for the Revell 1/144 kit although I'm turning it into a 1960s era 4 gun FLETCHER - and my build is over on Works in Progress (DD-566 USS STODDARD) - as such, the parts I'm designing are mainly at this point the tripod main mast, newer RADARs, antennas, railings, and so forth that are NOT part of the kit. The kit, while maybe one of the better ones (and larger!) on the market, still has its own set of mistakes and this is where well thought out and designed parts as replacements would be beneficial. Quite a few are already on the market (Model Monkey, for example). Also, a Shapeways Designer - DiStefan makes quality, scaled parts for this kit. You can spend your own time looking these up!!

The one advantage that I find in diving into this "sea of the unknown" is that fact that 3D parts certainly can come out a lot more detailed and accurate than scratch built ones - so, that's my draw on this.
When I purchased my Revell kit (from another forum modeler in 2017) it came with all the various 3rd party PE sets and as they are entirely geared to building the kit out of box, I am using some of these to augment kit & 3D printed parts as needed. My forum cohort and I have both decided that PE railings and such are simply 2 dimensional and not at all realistic, so are designing 3D railing replacements for our respective models that we are working on. This takes quite a bit of design time to get correct - trial & error. I don't think that whether you choose a low-end freeware design program or an expensive top of the line program with all the bells & whistles, etc. - that you can avoid going thru the learning process as to what will and won't work. That's a design basic, regardless.
By all means, go for it if that's your goal - but, I just wanted to give you a "heads up" that it isn't something you can do in a day (or week, or month, etc.).
Hope this clears the 3D air a bit,
Hank