Again there is NO requirement to have a "retail location" look it up the word reatail does not exist in any of the BATFE regs, never, not once.
As to not being able to get an FFL in your home, I know of at lest 4 people that did it just this year in fact three have an 07 and is are SOT payers. one is a gunsmith with no reatail space and no published hours and one is just a wholesale dealer (01).
Again I can prove that there are home based "kitchen table dealers" getting licneses now, renewing licenses, and I can prove that there are tons of NON RETAIL mfg's and dealers...call savage arms in Westfield, MA and ask to buy a gun at their retail store. Call Camfour and ask to walk in as a retail customer and buy a gun from them...can't do it. In fact most mfg's and wholesalers speficically DO NOT maintain a retail space.
TO date all you've been able to say it you need one you need one...with no proof...just more bs.
http://www.camfour.com/