I estimated that I could be the GC and convert it for around 13k:floor-3kdry wall - 2KRecessed lighting - 1kElectrical - 1kPaint - $250Insulation - 1k (fiber glass)Floors - 1kHvac/vent - $1500Baseboard crown molding - 2kWhat are your thoughts.

Timber is very much regionalized .. by species and use of the wood products for fiber.  

I like fiber mess mixed within the concrete as it makes the slab stronger and less cracking. 

Also look for neighborhoods that have google fiber.

If I do change it out, would you recommend fiber-cement/hardi or LP or what else?

There was a story on CNN about Googles Fiber Wire going there and a lot of businesses following it.

For instance; how many stairs, the length of the stairs, wether he's using rebar to reinforce, is he putting fiber in the concrete, is it colored, is he going to dowell into existing concrete.

The roof was a special fiber-based Spanish tile that had an installation manual that was voluminous.  

We also had to do some carbon fiber strapping as our foundation was bowing inward as well.  

Does the act of installation stir up fibers?