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Angier -

   Do NOT install your master relay in the same area as the power pack.
I and many others installed their battery behind the seatback on the
passenger side. Simply make a flat mounting base for the battery out of
1/4" or 3/8" honeycomb. Cut the honeycomb so that it installs
horizontally (with the plane horizontal), extending from the top of the
aft spar rearward to the fuselage bottom (about 12"-16" long and wide
enough for the Concorde RG-25 or RG-35 battery). As usual, cut back the
edges of the honeycomb and backfill with micro. Install an additional 2
ply layup on each side of the honeycomb for extra strength. Go to a
marine store and buy a nylon-strap type battery hold-down. Before
potting the honeycomb, install the two clamps supplied for the nylon
strap (template the locations forward and aft from the battery footprint
and use 3/16 area washers on the bottom of the honeycomb). Pot the
honeycomb mounting base in using micro and follow up with 3 ply
reinforcing layups. Install the master relay on the seatback, directly
above the battery. Just make small custom brackets from 1/4" phenolic,
contoured to fit the seatback. Pot them to the seatback with micro and
follow up with 3 ply layups. Do not get too fancy and make a cover for
it. It needs to radiate the small amount of heat it generates. One
builder reported in the LNN that he burned out his master relay by doing
that. There are a LOT of variations on Hydraulic power pack location. I
installed mine on the aft side of the baggage bulkhead and am happy with
that. I'll write more on that later.        
                                       Bill Rumburg  
                                       N403WR  (Sonic Boom)