In the back ground of the last photo I see a ceiling fan setting on a bucket. Use it! Put it in the highest spot in the ceiling and have it blowing down. Preferably in the center of the room. This will make a huge difference. I converted my double barrel wood stove to burn waste oil and have never looked back. Took me several years to come up with a simple burner that burned clean but now I can throttle the stove from warm to red hot and my non insulated shop is toasty warm even when below zero. If I was good with this darn computer I would make a diagram like yours of the burner and post it. Extremely easy to make. My stove pipe is old 8" auger tubing. It goes out the back wall where it tees into the vertical pipe. The bottom of the vertical pipe sets on the ground and runs up the back of the shop to above the peek. Been there for 30 years and has worked like charm.
Good luck with your project. What program do you use for your drawings? They look good.
Would love to see how you designed the waste oil burner.
Especially the throttling part of the design.
Not to steel this thread perhaps on a new thread.
Thanks in advance.