Double-glazing fixed panes

I have 4 fixed windows (ie non-opening). Timber framed in brick veneer, 70s yellow patterned glass, top edge parallel to cathedral ceiling line, ie not rectangular. Verrrry 70s! In addition, 2 are cracked.

I want to replace the glass, and double-glaze these.

Ignoring the complexity of the irregular shape, is double glazing as simple as:
a) Knock out the existing glass
b) Insert a new sheet of glass cut by the friendly local glass people
c) Add a timber bead (10mm gap?)
d) Add another sheet of glass with a final bead to hold it in place? Of course, silicone each in place etc.

And should I give any consideration to thermal properties, eg S-glass in one or the other sheet? If so, which one, the inner or outer? I assume the outer would be cloudy glass, since the windows are exposed to SE and NW light so cop a bit in summer.

Is there anything else to think about? I had briefly considered getting new windows made to suit, but the price doesn't look pretty.

Regards and thanks

Compleat


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