Yes, up to five weapons for all types.
As to build speed, I gave structure and ship builds rates a 4.0 modifier for the Faster game speed. Structures really need a lesser adjustment than that since they generally build faster anyways but ship build rates end up close to vanilla relative to ship cost.
I will do a 4.0x multiplier for Fast and a 6x multiplier for very fast then on ship buildrates and a 2x and 4x multiplier for Structure Buildrates respectively.
I don't think structures can be repaired from orbital dockyards, so maybe give construction frigates an ability that repairs structures in their fifth slot? I don't think you're using any abilities like Communal Labor or Civilian Ship Safety Act so you should have the Ability-4 slot free for something like that. Also, starbases have no passive antimatter regeneration so if you want them to have any strikecraft capability you need two levels in the AM upgrade since refueling stations don't work on them, so perhaps just make starbases and only starbases not need AM for fighters?
We can just make the dockyards refuel starbases as well. I'd not like the starbases to have unlimited fighters (no AM) asthat would undermine the value fighters (and losing them) represent.
If you had any room for abilities I'd suggest giving planets a "Supply Lines" ability that gives friendly ships, structures, and starbases a 1.0-1.5 AM regeneration buff and just removing passive AM regeneration from structures so players need to maintain control of a planet if they want their hangars and refueling stations to work, but Rebellion moves some UI elements around so you can only get one planetary ability without UI errors, and that's taken by the auto-dock "script".
Nice Idea, but I'd rather have the Capitalship Factories and the Frigate Shipyards slowly repair and recharge one ship at a time, and only the respective types.
I think it's not just build rates that slow the game down, but also the time it takes to research those key techs that describe your faction's history through the B5 story line. While researching those I'll frequently speed the game up, unless involved in combat of course!
The idea behind this slow research is that, after playing many different RTS games, it mostly comes down to who can research the latest tech the fastest. I do want people spend time in the different "epochs" and it should be detrimental to "level up" too early.