Materials are always the limiting factor in capital construction, we will never be able to mine at a rate that matches our max production. This gets much much worse when you move to the bigger capitals like dreads, frieghters and rorqs.
You can suppliment what you mine with buying but that means either some poor sod has to sit in Jita 23/7 playing the 0.01isk game with buy orders or you could buy off of sell orders at which point you can kiss any profit you hoped to make goodbye. You will likely have to do this anyway with Zyd and Mega since they cannot be mined in highsec unless the wormhole can supply these.
Cecil Montague / Capri Sern - PCGE Consultant
"There is no such thing as an effective segment of totality" Bruce Lee - The only man with a Chuck Norris Killmail