Help my sister Heidi Build Her Home

As long as my sister Heidi has been in an adult she's wanted to just live in a little cabin on some land in the middle of nowhere. last year she and her husband, Chris, purchased that property with the intention of building their cabin on it over the summer/fall, spreading out the time and expense to get it built. Four months ago her husband passed away.  In 2 weeks I'm going down with a friend for 10 days to build her cabin.  Because this is happening in a timeframe of days instead of months, it's a financial strain.  I'm asking for any help in gathering materials such as insulation, siding, and roofing.  Any extra will be used for quality of life updates such as a generator, heater, and/or solar.