Well, I decided to move forward with the mini splits, ordered two 9,000 btu units, 110v. Went with 1110v vs 220v mostly to save on breaker spaces, I only have 12 on the panel I bought. They are supposed to heat when it's down to -13 still. I ordered disconnects, wall mounts, electrical whips, piping trim and a new torque wrench and some open end crow foot wrenches for torqueing down the flare fittings. Seems most of these fail due to either under or over tightening the flair fittings and losing Freon. Total for the units and other items $2080
These are the units I bought:
https://www.amazon.com/dp/B08K3P2PTY
I'll have to get my vacuum pump and manifold gauges from storage, but the outside unit comes pre-charged. Just have to vacuum out the lines and indoor unit once the connections are made, then release the freon for a quick pressure test. If all looks good after a few minutes, release the remaining and open both valves.
I also decided to go with a tankless propane water heater, non-condensating. 6.5 GPM, which is more than big enough for the single bath and kitchenette. The zero clearance ducting for it will make it an easy install, simply up and out the end gable wall. I'll still have gas line to install, about 15' total. The water supply for the cabin comes from the house, which will run through the water softener first. Probably will put a line filter in front of this too. This was $1000 total, including the ducting and service valves (for running vinegar through once or twice a year to descale).
This was the model:
https://www.amazon.com/gp/product/B0084CPEFW
That model can be fitted with a circulation pump too, not that I need one, to circulate the hot water on a schedule before morning showers to have instant hot water. They have a special valve that you can install at the far end of your house on the sink connections to retro fit it for existing lines. It basically used the cold water side as a return to just get warm water to the faucet.