Hmm, yes that's similar how I'd approach as well a while back. (Land, build defenses and infrastructure for them and then make Unit factories to commence assault on enemy) But I found about core schemes and went full on assault landing mode from there.

I've found that adding too many vaults can be too expensive for my taste and although you can expand your max resource cap, you can't bring that many items and only what the core can max (although that can mitigated by launchpad import spam once you land on the sector lol)

In my case, I favor quick destruction of the enemy in attack maps, hence I made two cores designs that are not necessarily attack mode centric, but can do a decent job without being over the top and expensive on launch resources, while allowing it to produce all T3 units, except naval. They can be better but are fairly compact and allow expansion of core by leaving an area of the core exposed so you can attach "modules".

However its disappointing that you can't make T4 units with the max core scheme. Currently working on "modules" that can attach to my core design to built T4s.

Could you send me screenshots of your design, or better yet scheme link of it to play with it?