You do realize you are beyond a D.I.Y .er. Most non pros would not have tools of this level. I like the fact that you are raising the bar on home car restorations on RU-vid. Lots of hacks out there, you do quality work. Please keep posting your work.
Dude you are a Jedi. A car guy that reads the repair manuals. Stunning. Lol. I am an aircraft mechanic and we have to have the manuals out on every repair we do per the FAA. It amazes me how many people just wing it and guess what’s going on instead of actually looking in the books.
The inline filter www.hvacquick.com/products/residential/Indoor-Air-Quality/Inline-Filter-Boxes/HVACQuick-CFB-Series-MERV-13-Inline-Filter-Boxes The blower was generic from amazon www.amazon.com/HVHF-08COMBO-Cylinder-Velocity-Portable/dp/B004GHNKT6/ref=mp_s_a_1_6?dchild=1&keywords=fan+blower+portable&qid=1626488636&sprefix=fan+blower&sr=8-6