Lots of great points here, I'll address them by response:
@nik moushon my research shows me a hand full of both surveying and geotech companies in the town of fairplay, as well as nearby in summit county, so I'm hoping travel costs will be kept to a minimum and stay around 3k total. Structural engineering could be done prescriptively, however with the high wind and slow loads and mountainous siting, I am leaning toward using an engineer I've worked with on many projects before for a reduced rate, say 2k. Plus permits and review fees, 8-10k seems within the realm of reality.
Heavy equipment should be limited to a skidsteer for grading and excavator for footings. Doing quick research from local companies, both have rental rates around 1k per week. I'm sure I could tow these smaller machines on my own, but we'll say 4k total.
With these, I'll be able to perform all grading, and excavations, and cut the driveway. Add estimated 2k for materials.
Water and septic will be a doozy, but at least there's a government resource for looking up neighboring well depths which are averaging 225ft. The drilling company I spoke with puts costs at around 20k including installed pump and tank. This leaves septic which I have limited info on thus far. For now I'll assume 10k although I will be performing the work myself.
@Bill S. Frankly, I haven't dug very heavily into finding financing yet, as building won't begin until early summer of next year. I'd have 20-30% down at that time so my limited research makes me think I'll do ok here. Calculators have me estimating about 5k.
@JH Bridge a lot of good advice on planning for being a good distance from Denver. Concrete will certainly be an upcharge from Denver, however there are several companies local to the project area that I would contact first to keep that down. It's hard enough to get concrete scheduled in Denver as it is! Their availability is going to be key in getting this project dried in within the 6 month build season of the area.
This updates rough numbers to:
-35k land
-100k loan + 5k fees
-10k permits engineering survey soils
-30k well + spetic
-electrical and phone hookup placeholder of 10k
-6k for heavy machinery and gravel drive
This rounds out to 196k total costs. My only comps in the area of this squarefootage are older homes selling for $250k, so this will be something I need to go over with a realator to see how far above this I'll be able to get. With estimated 15k in closing costs, I'm not very into 40k profit for this much work and risk. If I could clear closer to 300k, it could be game on.
My next steps are more research and quotes for specific lots to aid in clarifying costs.