This piece has three parts. The fame is 2 and the glass is 1. OK, so I have a jpg of the loco's blueprints. I copied and enlarged the section of the prints containing the window in PSP. Cleaned it up and then reduced it to 2 colours saving it as a jpg. I then blurred it over so that I could get some nice smoothing in Bryce. I opend up Bryce and created a terrain. Went into the TE and loaded the jpg. I messed about with the settings until I had a half-decent 3d terrain, smoothed it as much as I could without spending half the night on it and brought it back onto the workplace.

Now I have a frame. It is just that - a frame - so there is no need to boolean anything.
I copied it, pasted, flipped x and brought the 2 parts together to form what you see here. This means it's the same on both sides.

Then I went back into PSP - note the lack of forward planning here - and filled in the hole on the jpg. This gave me a shape that I could use as glass to fit inside the frame. viola' .

I'll use the glass as a neg to cut out a hole in the cab bulkhead before I fit the window.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...