Weber 6M18 TMB amp questions

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Anyone built one of these? Or looked at the circuit? All I have is the layout dwg, as I want to build a Marshall 1974 18W clone. I see a Marshall EL84 and PI circuit faithfully copied, but the preamp is from a Fender 5F6-A Bassman (same TMB tone stack and cathode follower). I want my amp to have the "Marshall" sound, to compare with the Champ, Deluxe and Bassman clones I have already built. So what is the "Marshall" sound? The EL84s? The preamp biasing? The PI taking inputs from separate channels? I know the 1974 18 watter has its own sound, not like the bigger Marshalls, but I want a faithful reproduction if possible. I won't be using the Weber design, it is too compromised, taking from both designs. but wanted to see what you DIY-ers thought. Thanks!
 

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