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Using Hand Tools
If I were to use hand tools to carry through this task, I would mark the cut lines with a Sharpie and use a hack saw to rough cut just outside of the lines. Remember, you can always take off but you can never add on. It's always best to leave a little excess and slowly remove the material till you reach the line.
I rounded the front portion and flared the back portion to the back point of the plastic stock. Straight cuts, some possibly angled may be a bit less difficult if you don't have access to shop power tools.
After making your initial cuts, you're going to want to smooth things out and remove any excess materials to your cut line. You could do this with a sanding drum on a dremel but you're working with plastic here that tends to melt. The friction of the sanding drum will have a tendancy to melt the plastic. You're probably better off starting with a coarse file and once close to the line, changing to a fine file to smooth out the hatching from the coarse file. Now that you're right on the line, use some coarse sandpaper or sanding sponges to smooth that, then fine sandpaper or sanding sponges for the final finish. You'll notice that all of this cutting and sanding will turn the black plastic to a lighter grey. The fine sandpaper should smooth the surface and make that not so relevant. I wiped mine down good with an old t-shirt, then applied some ArmorAll protectant used for automobile vinyl tops which made the discoloring pretty much nonexistent.
As most all of my articles, I will mention that you don't have to do this mod in the exact same manner as I've posted here. Rather than the top, you could cut the bottom portion off or whatever portion suits you best. This article is mainly constructed to get your creative juices flowing so create, duplicate or differentiate.
Technical Information
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