There is a great ready-to-use Tapuino on sale at eBay by c64bits, which is perfectly fine for C64 users as they can bend over to look at the display. But for use with Commodore/CBM PET, especially as Datasette #2 (internal connector), you will want to unsolder the edge connector and add a cable. This stand serves as a cable guide and holds the tapuino upright for convenient usage. Optionally glue the wedge under it to tilt it a little bit.

See attached .SCAD files.