System is no longer in place. GT is gutted to the ribs. So have the ability to install what I wish. We're also rebuilding the front twin/drop table into a U shape center pole table setup, so will have increased area under the seats for water system and storage.
The drawing above helps fill in details of what shold be there as it is very close to original.
Know there are some new designs out there that take into account better blow down, easier draining of system and new technology pumps.
Thanks for your help!