I'd like to convert a loft space into a double bedroom although initially I just want to get the glazing in place.

Currently the loft has a decent sized N. facing Velux rooflight and a small S. facing Velux rooflight which lends itself to an en-suite.
On the W. side is a large single glazed gable end triangular window, with a 4 M base at about head height. The old wood frame needs replacing and, thinking Maintainance wise I was toying with the idea of powder coated aluminium 3G. I've contacted several curtain walling companies who all say they can do it so no shortage there. Does anyone have any experience of this type of thing indeed tips on glazing, opening casements, etc?

Thanks.

Thanks Dave I'll look into those, especially the section sizes.
Because the whole area is quite big I need to somehow come up with a mullion and/or opening casement design.
At the moment there's just one central mullion and even if I replicate this the glazed areas left and right would entail quite heavy 3G units to manhandle. Splitting them further would solve that glazing problem but may end up with the whole glazed area with a lot of heavyish framing, if in wood, hence my reason to look at Aluminium.
I hope that makes sense.