Suggest you split your budget into components:
1. Clearing land - checking drainage and firmness of footings, pruning trees etc
2. Slab, pier and wiring mains power ($300 - $1,500)
3. PC, UPS and/or line conditioners and network infrastructure
4. Dwelling (four walls and floor) for the size of observatory you wish ($300 - $800)
5. Roofing system - roll off, rotating dome and degree of automation you want etc (here's where you could spend $1K - $5K)
6. Heating, cooling, fridge, etc - how basic or comfortable a setting to you want?
7. Security system and insurance
Allocate $ per each major category of spend.
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