I have the digital but I can't find the paperback

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I don't know what's up, but I'd bet with recent changes in Washington, the military will be impacted in some way.  

A structural engineer is your best bet.

Personally I'd imagine going conventional or refi conventional and another FHA will be the best bet though.

I think the best bet might be to finish up with the current GC.

Suzanne B. there are a couple of steps to consider:1) Removal of the old radiators, pipes, and boiler (I've repeatedly (3 times) had this done for free by people who want the scrap)2) Installation of the furnace, trunk, and plenum (five times, cost of furnace plus $1k in labor/mats)3) Installation of ducts (depends on the type and length of ductwork needed, put I bet in your case it won't be too crazy)4) Installation of returns (same possibility as #3)In my experience ... for #3 and #4 it depends a LOT on the layout of the house, and how often the people you hire have done the work.  

But your best bet would be to find something already zoned for multi family.

What are some of my options or is waiting it out rather than spend any more money on legal the best bet ? 

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