Posted for "Bryan J. Burr" <bjburr@mwheli.com>:

 I basically did the same thing but instead of having the fwd bolts
 protrude into the aileron crossover plenum I extended my aluminum bar
 stock forward to the fwd bulkhead flange.  You can see a little of it if
 the seat is full aft.  This allows me to get a wrench/socket on the
 lower nut.  The aft bolts protrude through the bar stock and are easy to
 reach with the seat slid full fwd.
 
 Bryan

"""
 When I decided to move the seats aft, the front bolts that hold the seat
 rail to the seat platform now fall between the bulkheads.  I originally
 decided to mount the seats to the seat platforms before installing them
 in the plane.  Worked great!  But.....  I can't install the interior
 panels with the seats installed!  I need the seat platforms in place,
 then the interior panels, then the seats.  I installed nutplates on the
 bottom of the seat platforms. The seats don't slide aft enough to allow
 easy access to the front bolt heads.  I don't just have to hold them
 still now, I have to be able to tighten them from above.  I found some
 Phillips head bolts, and some hex head bolts.  The Phillips worked great
 if I folded up the corner of the seat upholstery and accessed the
 Phillips head through the space between the black tubing and the
 aluminum seat pan.  I still have temporary upholstery on the seats, so
 it's easy to just yank up the corner of the foam, but I don't know what
 I'll do when the final upholstery goes in and wraps around the corner
 onto the black tubing.
"""