1) Too small for hoses, you will have to enlarge them anyway.
2) Your hoses will have to pass over the main spar.
Best to keep as straight a run as possible and leave plenty of room for the hoses and their end fittings. Hoses will need to be replaced down the road, so make it easier for yourself. Route them high so they are accessible with the side panels off. Because the openings are so (relatively) large, I made a modified aft panel behind the rear seat brace to accommodate the opening through the baggage bulkhead and also trimmed the rear compartment cover back there. The rear of the panel only had to be moved inward enough to cover the hose penetration and there was still plenty of room to make screw attachments for the rear compartment cover where it had been trimmed. I initially only got grommets big enough for the hoses before I realized my error and got ones big enough to accommodate the hose ends but there was plenty of edge distance on the bulkheads going forward, with that aft side cover at the rear being the only interference.
Rather than trying to make a whole new cover, I simply moved the aft end of the existing cover inboard and drilled new holes for the attachment to the baggage bulkhead and floor. This left a gap between the panel and longeron at the top, which I filled with some sheet aluminum to make a new top flange for the panel, which was drilled to the panel's old top flange. Then I trimmed the excess old top flange before riveting the new top flange in place. It looks natural and doesn't steal much baggage space, maybe 100 cubic inches or probably less.
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
EAA Technical Counselor #5357