This sounds like a perfect fit for the "new" Airbnb algorithm, where they seem to promote the unusual stays at a premium over the traditional. 

A big challenge was sourcing materials for items we were doing ourselves, due to COVID delays and significant price increases.

I don't think it will have a material impact though unless you're in an area that would be particularly hard hit.

We're not big fans of purchasing materials ourselves.

We have already gone 50/50 (I paid the downpayment plus carrying costs while he paid for all labour and materials - he's the handy one).

I am shooting for seller financing and I put that in the letters. total cost of this one will be about $90 in postage and materials. 

Electroplating property, excavated areas were backfilled with clean fill material and the site was restored with a temporary impermeable asphalt cap to prevent infiltration of stormwater.

I need to replace the floor and paint the interior house (walls, trip, 2 doors) The contractor that I worked with him until now raised his prices dramatically and I would like to create a benchmark for me in order to make sure I'm not overpayingI like to ask you from your experience, how much should cost installation of the vinyl floor (materials and work) for 1 sqftAnd how much should cost regular interior paint: (walls, trip, 2 doors)  for 720sqft.

I'm also looking at Wells Fargo's non-owner HELOCS...They have a 1&3 yr fixed-rate promotion but has amortized principal payment (not interest only) and requires full-doc.     

Building materials are up across the board and lumber is sky high.