I did something close to this myself, I did mount a 12x12x6 plastic box on the outside of the house for the splice (Home Depot). The electrical experts said that MDF cable can NOT go inside the house, not 1" even! Use a cable splice to make up the junction. Such...
I have NOT installed the DC or compressor yet, still doing drywall and paint before I get the hardware in place. Going to have a 20x24 "filter" by the steps for exit air, will be some drywall "zig zag" in front of the filter to block noise.
I am currently doing the finish steps with my setup. I put the units under the steps and enclosed them with framing (2x4) and sheet rock. I also put insulation on the inside and then sheet rock on the inside of the closet space. The "triangle" shape room is 10Ft high and 14 Ft long, with a sound...
I used the Rust Bullet on my new floor and I live in the SE with high humidity nearing all the time. I was kind of lucky that the days I did the coatings was under 50% but what really is the issue is the working time goes down with higher humidity. While I did not have to paint like my hair was...
Stainless is best, I like to use ss deck screws over nails. Anything other than SS can give you staining, however some of the new coated screws are pretty good but not really a cost savings over ss.
If you have 2x8 joist you can add the 2x4 over them to get just under 11" for the depth. Based on the Owens insulation charts for R30 you need 10.25" so that would just make it. The real issue is if the roof joists are made for storage or just plain, as the loading on the joists is very...