My brake and clutch lines were down the side, through the chassis members, however they both then jinked out at the front into the footwell and went through the panel around the rack, making them exposed and vulnerable to damage from shoes, would not have passed IVA. They are now down the tunnel. The whole rear area of the tunnel is really cramped, raising it even 10mm would help!
Just to be clear, raising the height of the top of the tunnel frame to give an added 10mm of space within would be on my scratchbuild list of 'improvements'.
Nick, you may want to put thermal insulation around the 38mm pipes, so leaving clearance for that?
K