Yep. That should work. Some detail and alternatives: How we got to the plywood and glass kludge was almost predictable. Someone defined the need. Management declared that there was no money, floor space, staffing, etc. Irritated engineer throws something temporary together to be used only until the necessary money, floor space, staffing, etc are found. However, since the temporary kludge worked reasonably well, the crisis had been averted, and the kludge become permanent.
Moral: If it works, it's permanent.
That does happen if one stretches the tape when laying a trace. It's especially bad with narrow traces. Traces will move, especially if the layout is left in the sun. I used a rubber roller from my wet photography kit, to flatten the traces and make sure they're properly stuck to the mylar. (Incidentally, note that I used acetate instead of mylar in the above layout. Not a good idea and I forgot why I did it).
For RF, rounded corners are a problem due to impedance bumps. Sharp corners are equally bad due to reflection problems. The compromise is a chamfered corner (mitered bend): which unfortunately also makes a tolerable fuse at the bend.
However, the above PCB is not an RF board. Instead, the problem was the cheap wave solder machine that we were using at the time. Somehow, it often managed to burn or scrape off the solder mask on sharp corner bends. The result was usually an impressive solder bridge at the corners and a tedious touchup job. I was never able to determine the cause, so it was circumvented by using radiused bends and liberal trace spacing.
I had a weird situation at 3 consecutive companies. After the usual extremely long management inspired delays deciding if the company should work on a given product, a schedule was created, usually by the engineering manager. Invariably, there was not enough time to work through a proper design. For example, one project that took about 8 or 9 months from conception to delivery, only allowed 2 weeks for the initial (paper) design. Everything else was allowed a fairly normal period (breadboard, testing, FCC certification, compliance testing, fixture construction, prototype run in manufacturing, etc). In effect, the design was mostly frozen two weeks after the project started. Little wonder we needed a full prototype in order to find the inevitable design errors. If we had time to have done a more rigorous design, much of the subsequent fire drills could have been avoided.
As I previously noted, my attempts to do one product perfectly the first time, failed because the PC fab house reversed the component and circuit sides of the PCB.
Lesson learned: Trust but verify.