Barry Knotts wrote:

Anyone have recommendations or considerations as to the dimensions and
placement...of floorboards?  ...I intend to make both sides removable as I
will have brake lines under
the pilot side as well as the fuel line under the co-pilot side. ... I'm
also planning on
putting the small auxiliary battery (24V, two alt, two battery system)
on the aft face of the pilot side firewall, under or at the floorboards.

Barry,

Now that we have Jim White's IV-P flying, I have more advice/opinions. The
placement of floorboards that were tilted to be lower in the back than the
front has worked out well. Be sure you make some cardboard mock-ups to
confirm that your feet fit and work the rudders/brakes easily. We also
extended floorboards rearward to the side of the vertical instrument
panel/hydraulic gear/flap cover, and then down at an increased angle so the
fuel line could run in from the side and under the floorboard.  The two
lower engine mount bolts are accessible under these floorboards--in addition
to the fuel (and your brake) lines. We put Jim's aux batteries under the
right floorboard, but I'd do it differently next time. They are virtually
impossible to get to. Also, they are right on top of the exhaust pipe. While
the need for access is much higher during our current flight and ground
testing, this is such a pain that I'm moving them in a more convenient
location on my plane...probably the front face of the main spar box on the
right side? I couldn't fit anything as large as a battery against the
firewall in front of the rudder pedals without interference. You might check
this.

Hope all this helps.

Bob Pastusek