Please remember that the airships were never meant to be for personal use. A lot of the changes you'd make on that list above would only benefit one person as a lot of it is unique and some things cannot even be traded (ie ventures). If you want to take on the airships all on your own, then yes you're going to be investing a lot more personally versus an fc full of people all contributing. Also be aware you don't have to constantly be updating the airship part tiers. You can level them up to 50 with the bronco parts just fine while swapping out with final build parts gradually as you level them. You will not be using 4 x Viltgance parts at 50 as they're 31 components each and at 50 you have a maximum of 61 components per ship build.