Thanks for the kind words guys...
Jaybe ...yes they are R&M cap for a LeMirage for a 8" roof raise. They req'd some mod's to fit but not too bad. The coach is a 96" wide.
Pat ...I haven't been holding out on the pictures ...these pictures were posted athttp://www.busconversions.com/bbs/index.php?topic=2547.90
you just forgot they were there.
The ceiling works in my bus because the ceiling is flat. I raised the roof 8" but I welded angle cross at each roof rib as shown in the picture. Because Prevost has a tight corner radius, this only drop the ceiling down by 4", 6'-10" to the floor.
In that space between the underside of the roof and the top of the angle I installed my air ducts for the A/C (I made the air ducts out of a 1/4 ridge insulation with foil on one side. The ducts were 3x10 O/S, one on each side and 2 T's ,plenums. I joined up both A/C with the ducting so I could run one A/C unit and it would cool the whole coach.
I also ran all of my main electrical feeds in the ceiling, from the breaker panel to junction boxs so I could access all these box for future additions or WHY.
As you can see in the pictures the outside panels are above the center panel and I ran cabinets the full lenght of the galley and salon, I could screw these panels into the angle. The O/S panels are 2'-4" wide both sides.
The A/C ducting hangs out passed the panel by 3". In this 3" I cut 2x4 holes in the duct's underside every 2'-0" or so. I then install 2x2 strips of wood length ways in the salon / galley area screwed to the angle at the edge of the ducting (one on each side) this gives the drop for the center section of the ceiling. I then drill the 2x2 wood strips /w a 3/16 hole, horizontal to the perpendicular every 48" O/C
Then I made 2 center panels (4pcs of 1/4" plywood) with the split in the middle of the 2 panels and a diamond cut-out (half in each panel, under the mirror) this is the return air hole for the A/C and the mirror hides the join of the 2 panels (the mirror dropped 1 1/2" down from the center panel section).
I then made the center panels so they overlap the O/S panels by 3" on each side. I put 2 pcs together (1 panel) and screw 2pcs of 2x2 length ways so they fit I/S the 2x2's srcew to the angle. I then glued a pc of 1/4 plywood at the join of the 2 pc of plywood. I then glued the foam down to the plywood and put the vinyl on and staple it to the back side of the panel...DO NOT glue the vinyl to the foam. You then lift the panel in place and with a long screw bit put a 3 1/2 lg screw inthe 3/16 hole and screw it into the 2x2 attached to the centre panel, this way there is no fastners showing. The A/C comes out the drop along the O/S edge of the center panel
I used a 6" radius on all of the corners so the vinyl wouldn't fold, and I ran the foam around the edge of the plywood so the vinyl would have a soft edge as it was pulled around the edge.
I addition the angle has 1 1/2" ridged insulation fitting between all the way across and Roxal insulation around the ducting and all cavitys. The roof is also spray foamed.
sorry for the long post I will try and make an X-section drawing for thoses that what to persue this further.