A look at the PiDP-8i replica kit from Obsolescence Guaranteed by Stephen Cass.
I finally jumped on the PiDP-8i replica kit from Obsolescence Guaranteed because it had a 2020 refresh, fixing a few rough edges from an earlier kit in both the hardware and software setup. And Obsolescence Guaranteed also went to the trouble of getting custom white and brown switches made to help duplicate the look of the original front panel, albeit at a 6:10 scale that makes it much easier to fit on a shelf. (Technically, the kit emulates the improved PDP-8/I released in 1968, which was made using integrated circuits instead of the discrete components of the PDP-8).
The core emulation software is the aforementioned Simh, and some programs have been preloaded, including some of the earliest computer games like Colossal Cave Adventure, Star Trek, and most notably Spacewar!, which you can play by setting a few front panel switches and using a program written in Processing on a desktop computer that emulates a vector display. You can also try the pre-Unix multiuser operating system TSS/8, which lets users run programs in Basic and Fortran, although, be warned, this version understands only dates between 1974 and 1985.