27 - Firewall (completed); 28 - Fwd Fuse Lower Structure (riveted to firewall assembly; prosealed)

The firewall-related sections are starting to take shape!  I'm really enjoying building this RV-14A - Van's, you did an excellent job with the instructions and overall assembly process.  I'm constantly amazed when all the holes align.  I used "Proseal" again this week - I really missed the smell, and I've grown fond of using it.  Here are the specifics for this week:

- riveted nose gear brackets and firewall angles to tunnel sides; dimpled stainless steel firewall sides
deburred, countersunk and primed firewall angles; riveted angles and gussets to firewall sides; deburred and dimpled firewall top; deburred, countersunk and primed firewall angle (F-01401D)
- deburred angles and gussets for firewall; countersunk relay doubler; dimpled firewall center
- deburred and dimpled forward bottom skins; drilled holes for COM antennae in skins; separated and deburred doublers, hangers, and fuel pump brackets; dimpled antennae doublers; dimpled skin stiffeners; prepped muffler shroud
- fuel tank sealant (“proseal”) used to seal top to side firewalls; tunnel sides attached to firewall; sealed center firewall (only fully clecoed at this point)
- riveted stiffeners and antennae doublers to forward bottom skins; prosealed muffler shroud sides to forward bottom skins (clecoed only; riveted muffler shroud ramp to sides, muffler doublers and muffler hanger angles; riveted fuel pump brackets to muffler shroud and added 4 nutplates
- riveted firewall skins to angles, nosewheel brackets, and gussets
- riveted relay doubler to firewall; riveted all nutplates to firewall
- riveted muffler shroud sides to forward bottoms skins; deburred and riveted cover bases to firewall assembly; prosealed and riveted firewall assembly to muffler shroud and bottom skins; clecoed rest of firewall assembly to bottom skins

Riveted nosewheel attachments to tunnel sides:

Dimpled L/R firewall skins:

I had to countersink almost every hole for each of these angles, so I primed those surfaces:

I used a combination of squeezing rivets and back-riveting to attach the angles to the firewall sides:

Other side:

Countersunk and primed the F-01401D firewall angle:

Prosealed the muffler shroud to the forward bottom skins, and clecoed in place (will rivet in 3 days):

Firewall assembly mostly riveted:

Center firewall skin, prosealed and clecoed:

Another view of the muffler shroud and forward bottom skins: 

Riveted everything on firewall, except nutplates and relay doubler:

other side:

I riveted nutplates (not shown); and then prosealed and attached the firewall assembly to the muffler shroud and forward bottom skins.

Looking inside the muffler shroud - these sections were blind-riveted (even the center firewall skin):

other side - since I used MK-319-BS for the center firewall skin, I put a bit of proseal to seal the hole of each rivet:

The full assembly, clecoed and curing (proseal):