Phatman,

I just happened to find this on e-buy this morning:
Lambert BB cups
The seller (Hillary Stone) is VERY reputable and well known in the
classic bike circles.
The Chainring is surprizingly light but yeah, it does look a monster.
I had the "Pro" model, top of the line with silver and black paint job
weighed 20 lbs when I bought it (complete with Lambert copy of Brooks
saddle), lightened it up some got it down to just a tad under 19.
The saddle was really uncomfortable, hard, didn't break in at all. Replaced it
with an Avocet Racing (II?).
You can check with Yamaha on the forks, but remember this was replaced
about 25 years ago (I'm thinking that I got my replacement in 78?).
The replacement was a Tange semi sloping crown, full chrome fork, you
should be able to find these (also on e-buy).
Post pics please.
(I'm kind of looking for a 21in Pro to recapture some of my mispent youth!).

Marty