Engine - where for art thou

For those who are interested
Main System:
Highly modified Michell Orbe with SME V arm and Denon DL103M (FGS) cart, Firebottle OTP MKII
Technics SP-10 in Obsidian plinth with AT1010 PMAC v8b arm and Goldring Elite MC cartridge, BB3
Leak Lenco GL75 with Ortofon OM10 cartridge
Raspberry PI with R-2R DAC and 7inch touch screen running Volumio 3.0
Marantz CD50SE
Technics RS-BX404 Cassette Deck
Audiolab 8000A (1985 model)
Reiver Jenna full height speakers