I fabricated some aluminum supports for holding the hydraulic pump solenoids and the front and aft battery boxes with their solenoids. I have had very good experience with the Concorde 35 series lead-acid batteries in the Viking, so I thought I would use them in the Velocity.
The plan is to have an aft main battery for starting and providing power to engine and other accessories, and a forward battery in the nose compartment for the avionics. A switchable crosstie will allow charging of the nose battery from the alternator through an isolation rectifier. Both battery boxes will have main fuses and current-sensing shunts installed, as well as two solenoids each (aft: master and starter; nose: avionics master and crosstie).