Damazio family's RV-10 project: Cabin heat and ventilation started

I had originally planned to attach the heat tube using brackets that another builder designed:

3D printed SCAT tube bracket for the tunnel

3D printed bracket attached in the tunnel

Forward 3D-printed SCAT tube bracket

This was getting complicated to attach (and not very temperature-resistant), so I instead decided to just use brackets attached to the tunnel covers - this makes it slightly more annoying to attach/remove the covers (4 more screws), but is way simpler and lighter, and by positioning them right at the end of the ruddel pedal arm travel, I can ensure that it'll clear those:

Metal SCAT tube bracket match-drilled to the forward tunnel cover

Metal SCAT tube bracket match-drilled to the aft tunnel cover

Metal SCAT tube brackets, primed and with nutplates attached

To attach the forward vents, just like in the tailcone, I didn't want to trust just the sealant to hold it in place, so I made doublers to rivet the vents to the skin, with equally-spaced holes through them:

Forward vent doublers cut out from sheet metal

Forward vent doublers in position around the NACA vents

Using graphing paper to mark equally-spaced holes on vent doublers

NACA vent with doubler clecoed in place, from the outside

NACA vent with doubler clecoed in place, from the inside

With those in place, I realized that I needed some way to connect the NACA vent to the actual panel vent, in what is a somewhat tight space - the plenum that SteinAir sells actually worked well for that, by giving me a flange that I can attach a very short SCAT tube to:

Distance from the panel vent to the NACA vent

Vent plenum installed in place behind the panel

I then installed the Aerosport air control to the top of the tailcone (which due to my unfortunate positioning of holes required completely removing the servo from it, attaching the rest, then reinstalling the servo in place: