I think a parallel system should be in place for estates.
For example, no reason not to allow home facade building for personal estates.
But also no reason for personal homes to need to be able to make wheel stands/buffs.
As to the airships:
1 Ship per personal home, a small ship that can travel to all the sectors, but likely can only hit 1 of the furthest out in one journey, or 2 of the closer sectors.
Reasoning?
Some of the airship mats, are just far too rare on server Market Boards for far too long making it so the average player likely will never see them/the items crafted from them. Also, even for a player in a FC that reliably finds and shares the rare mats w/ members, the reality is, there are now so many different rare mats+sectors to aim for that it is hard to keep up with everyone's desires, once again meaning it's hard to meet everyone's needs. Also FC's have access to diadem/diadem HM esp. But in order to do Diadem on a regular basis, they need to hold a ship (or more depending on needs) back, which means even less ships being sent out for mats.
Like right now, in my FC:
2 People are waiting on 6 Drav. Motes each.
1 Person is waiting on 4 Potters stones
Several Raiders are highly interested in V materias
Several people want Tincalconite
1 Person wants Antique Rugs
1 Person wants Shrub Seedlings
2 People want Oriental Grass
3 People want Fine Alumen
We keep one ship 'Diadem Ready' at all times, this leaves 3 other ships to go out on missions. We also have to unlock a couple of the new sectors yet. So with everything going on, it's almost impossible to accomodate everyone. Which is why, if personal homes, could send a small ship out, even if it could only hit 1-2 sectors each trip...it would not only help lessen FC loads, but would keep the server Market Boards more vibrant w/ the rare stuff, and make it so average players could maybe get some shinies.
And this isn't even factoring in, within most fc's the ave. member doesn't get much say in where airships go/how they are used.
Basically, I think there's a way to make it so personal homes can have a parallel system that doesn't really undermine the FC workshop worth.