...and if you're not a completionist, that's the time to stop spending mats on it, because four extra G5 material sets for 1m/s extra speed or 0.03LY extra range is probably not actually worth it unless you have a lot of spares.
In my defence, I like to complete G5 mod's simply 'cos, if I don't, I end up wasting even
more time trying to figure out why different ships perform differently.
I've spent, literally,
hours trying to figure out why two allegedly identical DBXs don't have the same jump-range.
Thought I'd swapped every module between them (though, as it turns out, I obviously didn't) and couldn't figure it out.
In the end I realised I was looking at it wrong.
I was focussing all my attention of finding out why one was
worse than the other.
Checked all it's modules, they were all identical, all G5 modded and none were one-roll legacy modules.
Last night, by pure luck, I happened to notice that one of them
did still have a legacy life-support module (which I only noticed because it didn't show up as being possible to remote-engineer).
I then got all confused 'cos this was on the ship that has the
better jump-range.
Turns out that this legacy G4 life-support is actually
lighter than a current G5 life-support module.
Lordy, figuring out engineering can be a chore!