After much consideration...I think I'll hold off until I have a first beta of the mod/server. You're right that at 100 mass, stuff doesn't get too crazy in terms of ship design.For myself I don't mind rebuilding such tiny stuff if you do consider the change, maybe give it a go and try emptying out & refitting one of your current 100 mass ships, try a more power hungry design and see how it goes on linear compared to the default version in terms of stuff like dps;mass, mobility, shield ratios. Might force some of us oldguard pvp types to reconsider the kinda ship design & shape we consider "dangerous" when going into fights a bit too on linear :p
Additionally, at 100 mass, it literally takes me an hour to build a ship from scratch (except for each faction's "big" ship with an interior), so I'm not concerned too much about rebuilding stuff. Indeed, some of my faction ships have oversights due to how the game works that I need to address with a rebuild - for instance, the Valron Flamberge is rocking both shield-eating autocannons, and powerful beam weapons, but the beams render the cannons obsolete due to how AI works. Thanks, game.
As to the stations, my plan with those is to have a dedicated power chamber; thus, the power system changes down the line won't affect stations too badly. I've almost got my Coalition Station built, and plan to showcase it and the ideas that have gone into it on my Week 3 update.
As for PvP advice...I've not really PvPed too much in StarMade for a variety of reasons. I think what I can do best for the PvP community, is expose gameplay systems that make PvP 'worth it' and more fun, but know what and when to take my hands off and let people build (and blow up) starships. Something else useful I can do is PvP with y'all and let you all kick my behind silly!
I'll always take advice from those who really love PvP into consideration, though - in other games, like FFXIV, I'm a PvP lover myself, so I know what it is to love pwning other players! I just have to mindfully incorporate those changes with the PvE modifications I'm making as well.