You can pick up 3mm Suntuf 900x600 in Bunnings, clear or various colours, for 55 bucks, or if you want 5mm (not recommended if you want to shape it) then $63. I had a shroud custom made in QLD a few years ago by an acrylic workshop, laser cut in 3mm translucent red, with bend, for 20 bucks. His stock trade was in shopfittings, so you could search custom acrylic shopfittings and see if they do small jobs if you don't want to buy the bigger sheet from Bunnings, or even ask if the shopfitter/acrylic workshop have offcuts if you prefer to do the work yourself. If you haven't worked with acrylic before, the best way to cut it is with a very high tooth count circular saw (121 teeth on a 10" blade is ideal but 80 teeth does a reasonable job, but be warned, even an 80 tooth blade will set you back well over $100 if you don't already have one), which gives you a virtually polished edge. A dremel cutting wheel at low revs works well too (too fast = melt), or even a hacksaw or coping saw, but you'll need some finishing work on the edges of course. You'll find some edges will leave you with no choice but to use dremel, hack or coping saw of course, so some sanding will be inevitable. Do not remove the protective covering until all cutting is done, or the finished job could end up heavily scratched. .