I recently used aluminium extrusions to build a window. Built a "perfect" frame, stuffed glazing putty into the spaces, then fit a glass in, which I had cut to

I recently used aluminium extrusions to build a window. Built a "perfect" frame, stuffed glazing putty into the spaces, then fit a glass in, which I had cut to size. Needed a DIY job as it was just for my garden house. There's more to a proper window than just the glass and frame.