Sliding Hatch / Sunroof construction

[Mat-C]

Sliding hatches or 'sinroofs' are are all the rage these days in even the smallest of hardtops powerboats. Can anyone point me towards some construction detail of a typical one? Thanks

[FAST FRED]

Most any book on wooden boats will show a good style sliding hatch, for lifting hatches the Maurice Griffiths double coaming is very leak prof and not hard to build.

With a BIG hatch the scantlings will need to be very robust. 2 or more folks may stand on it at the same time.

We have gotten 3/4 lexan from bus side window takeouts that were slightly scratched, at great prices.

FF

[Mat-C]

Thanks Fred, yes I have a number of books that detail typical, raised profile, sliding companionway hatches, but none that quite fit what I'm looking for: more of a large (preferably flush, but not absolutley necessary), 'sunroof' like those seen on the hardtop sports cruisers around these days - particularly the European boats. I know they range from the very elaborate multi-panel electric jobbies, to the quite simple hand operated ones... it's the latter that I'm looking for.
Taylor, Webasto and a few others have them commercially available, but not really in the sizes that I was thinking of.....
As always, any help greatly appreciated....