Engine, you do need to spread the load if putting something heavy up there. Spike shoes are a must when using spikes. if putting anything over 20kg up there I'd say go for decent size shoes 2p size would be good.
Not all LACK is built the same, it has changed over the years, using cardboard fill in some places where chipboard was once used and vice versa.
Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m