Skylight should be substantially cheaper than that. Velux Actives in 2x4 are $1700 at Home Depot all day long and while I haven't added any, I've had three or four replaced for $200 per. I'd maybe find another quote on the roof. "Thinning out bamboo" is a fool's errand. Cut it down to nothing and keep an eye on it as it grows in. Garbage disposals are easy. If you have power under the sink you don't necessarily need a switch installed in the countertop. Just put one of these in the face of the counter. The hole saw you need is $18 at Home Depot and $5 off Amazon. srsly tho. Garbage disposals are easy. Ours died and I had the Costco replacement in and functional within two hours, and that included an hour going to Home Depot to get the parts I needed to install it.