Jazz I think if I use old bra straps to hold down those marsh mellows they are not going to be that difficult to cut ;-)

I'm pondering my choices here wrt to the gantry... my heart says go with the ribs and my mind says listen to these experienced gents :-) Blackrat on here got me into contact with a local supplier of the right epoxy for leveling so that will make things a little easier whichever way I go.