Mr. Lionel - you seem to be the "early Mohawk" crew (as in your L2a) - so we need some of these. The essential existing L2a tooling could be used, I suppose.
L2b - sunken Elesco FWH:
L2c - Coffin FWH
Or - if you really want to go back to the first Mohawks (many lasted into the modern era, with updates):
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Scullin drivers!
Mr. MTH - your more modern Mohawk tooling is missing a member - I think it would be just the driver change - but I want one of these. An L4b version is in your latest catalogue, but with the more common Boxpok drivers, from what I can tell from the dark catalogue photo.
Very modern Lima with the Scullin drivers:
(Both brands have offered the L3a, though Lionel's needs a real re-visit.)