That site is a wonderful find! Thanks!
The mention that he has this huge blueprint, and shows shot of part of one which looks like the original of what is reproduced in the LIS Technical Manual, and which I redrew and incorporated into "Jupiter2s", above, made me wonder just how accurate that profile in the drawing/plan might be (D'oh! - why didn't I use the "10' Hero" drawing??).
I wouldn't have believed this in a million years, but the profile on that blueprint seems an almost perfect match over the screen capture of the 4' J2 I made yesterday. The main viewport seems a bit different (but that could be a slight shift in my overlay - I'm a total amateur at this sort of thing), but the shape of the hull and flashing light unit seem absolutely spot on. Or close enough within a very small margin of error, given that the models were never made perfectly symmetrically (or so I've heard). That profile above, the blueprint repro'd in Technical Manual, does in fact seem to be a what the 4' hero (and 10' hero) was based on.
The plan does exist???!!