I’ve built one. I found them really not all that useful unless you were printing the more technical filaments. The P1S can get to 55-60 with little effort on it’s own.
These use the same parts that I used to build one. I did not like the Mains power, and control was iffy. While I know the printer holds heat, the controller would switch on and off rapidly trying to keep the temp up. Thinking I hada a defective part I reordered and encountered the same thing.
Nothing is stopping you, go ahead. Good luck.