There are countless of Doom1 clients on the net but only one that really strike the balance between the classic gameplay and modern QoL is the crispy-doom.
Crispy doom is based on Chocolate Doom with enhancments:
* Large screen resolution with different ratio aspect
* Jump / Free look mouse movement (just like modern FPS)
* Lots and lots of QoL options
The client can be compiled successfully for ppc64le without additional changes.
FYI The Ultimate DOOM Wad could be found on archive.org
