I wouldn't suggest jigsawing to a scribed line ....too easy to end up with jagged edges, and if you are a bit off, you end up with a poor bond.
I would bend the front to the shape you want, then glue up the sides on top of an oversized bottom piece. After all is set, trim off the excess at the bottom using a router & a template bit (using the actual walls of the tank as your template). Acrylic cuts like hard maple, and need sharp tools. Even then, you will leave tool marks. You can finish the edge by flame polishing or sanding.
Bending of acrylic is tricky .... You need to heat the acrylic so it is pliable & bend it with a form .... too much heat & the acrylic burns and leave ugly brown marks, too little & it cracks when you try to bend. The pros do it in an oven with controlled temp, but we'll have to settle for blow torch or heating wires. When I built my overflow, the first few bends were all burnt (but since it is out of sight, the brown marks didn't matter.) I was only bending maybe 6-8" long pieces, longer bends may be even trickier. I used a propane torch for the heating, maybe heating wires would be more controllable?
BTW, if you are doing 90 degree bends, the acrylics will form dimples at the edges right where the bend is. You will need to sand that flush before bonding.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.