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then it became more of a singlespeed mountain bike
Ok @Canardweb, some clarifications...
Do you want a fixed gear or singlespeed build?
Do you want a mountain bike or just to have a fg/ss with 26" wheels and fat tyres?
Do you actually want to ride it off road?
Do you have to have double disc brakes?
What's the budget?
Are you prepared to have a frame modified to suit and is this included in the budget or will you do the work yourself?
Marino Bikes from Peru will build you exactly what you want for an extremely low price if you don't want to mess around...
he wants a fixed gear.