That is a difficult request without posting diagrams, but I'll give it a try.
First (and easiest), there was no difference between the first and second pilot version of the 33 inch model. The main changes to the 11 foot model were the addition of lights, but the 33 inch model was solid wood, so that was never an option. Additional differences...
- The 33 inch model had the same general window pattern as the 11 foot model from the first pilot (the series update mainly added more),
- It had the larger sensor dish, the domes on the front of the nacelles were solid wood with spikes,
- The rear nacelle caps had a rectangular feature (best to use Jefferies' original plans to match it),
- The grill features of the inner nacelle channels weren't there originally,
- The four white rectangles on the top of the primary hull were not there (those were access holes on the 11 foot model to change out bulbs, and weren't part of the original design),
- A lot of the markings on the top of the primary hull associated with the 11 foot pilot model weren't there on the 33 inch model (except the markings on the bridge), and
- The pilot version font was used (and the arrangement was similar to that of the 11 foot pilot model).
Also, the bridge didn't change size or shape. While it was originally shorter than the 11 foot pilot bridge, it was also taller than the 11 foot series bridge, so no change was considered necessary when the model was modified.
The original markings were painted on the model, but the later markings were decals (basically a one-quarter scale printing of the 11 foot model's decals... including the reversed numbers/letters). Datin still had a sheet and scanned some of them for his site (
here and
here).
I think that covers most of it.
Of course there is also the bluish dorsal as well... but it was so light (compared to the hull's gray) that most people don't even know it was there. :confused