making a window frame for double glazing

[Maevis Moon]

I'm building a workshop.
The most difficult aspect is I have a large double glazing unit, with no frame, that I want to use. Well its *free*.
This window is not required to open.
Advice on making a simple wooden frame please?
The glass measures 162 x 106 x 2cm
I thought of cutting a piece of 45 x 70mm into an L-shape (have circular saw, router etc).
Any advice?
(Please note: this is a glorified shed that I'm making, so quickest/easiest approach required, not building regs. Ta)

 

[foxhole]

Simple frame , baton either side of glazing .Silicon all round inside and out .