I'm about to attach my tailcone to the fuselage, but decided it would be significantly easier to install everything I need from mounts to wiring and avionics - in the tail, while it's still on sawhorses with easy access.
I will have two EarthX ETX900 batteries and needed to design an installation for dual battery boxes that deviated from the plans.
I designed and installed a mount for my Mountain High oxygen tank.
I installed my GTP 59 Outside Air Temperature probe. I selected the right side of the tail cone underneath the horizontal stabilizer to be out of the sun, but also shielded from prop wash and as far back to avoid exhaust influences. I made a doubler from 0.032" to ensure a solid mounting.
I installed the ELT using Van's ELT mount, which I had to slightly drill and nut plate for the bolt pattern of my Artex 345 ELT.
Lastly, I installed Van's OP-48 ADHRS mount, although I had to modify it for the GSU 25, added a 25A power diode to power my TAA bus, as well as provide a charge to the Aux battery. Note that the ELT antenna is also on the ADHRS platform. My tailcone upper skin is replaced with a ShowPlanes composite tailcone and will allow my GPS and ELT antenna's to be inside cleaning up the airframe, reducing drag a little, but mostly cleans up the exterior appearance. .