DJR, apparently great minds think alike - and apparently your's and mine do too...
Here's what I'm thinking:
C frame, with E down-tube and engine cradle.
F swing arm.Custom rear shock, based on a C reservoir, but with 46mm piston and guts from something else (125E?).
E tank.
D guards.
Not sure about seat yet.
250E forks & triples.
250H front TLS front brake.F rear brake backing plate.Custom full floating rear brake torque arm.
C front hub.
D rear wheel.
I'm not sure about what to do with the engine. The OW barrel has six fins, same as an MX125A. If I start with a set of C cases, the MX barrel goes straight on, but the drama is that the C cases don't accept the D/E magneto cover, as fitted to the '77 OW.
So maybe the answer is to use D/E cases and magneto cover, with an E barrel, and an
A cylinder head?
Ideally I'd find a sensibly priced
Shinobi head and use a
H/J radiator, but...
I'm not overly worried about the rear brake pedal - I might be overly optimistic, but I reckon that a little bit of machining on both the clutch cover and then back of the kick-starter will give me enough room for the pedal - the side loads can be supported by the clutch cover and kick-starter rather than the shaft itself.
Blue means I don't have those bits yet.