Just to chime in here on the unlimited categories; the 'rules' stated that one had to use at least 50% kit parts. Now, observing the winning models for the unlimited category, I see (to my eyes at least) very little kit bashing or scratch building. Regardless, I wonder how Revell and the judges quantified weather a model met that 50% qualification. On the submission form there was nothing to note about what other kits or parts were used in the final build.
On the model that I entered, I feel that I probably toed the 50% line as I did a complete engine swap, aftermarket wheels and tires and kitbashed seats. Now, I didn't count the number of parts that I swapped out from the original kit, but based on appearance it could have gone either way. I entered anyway just to see what would happen.
When looking at the builds generally posted here on MCM, I'd say that there is a lot of kitbashing and scratch building that goes on. Based on trying to stick within a 50% kit parts guide line could be difficult for a lot of experienced builders and I wonder if that kept the number of entrants down at all.
Edit to say, after looking again at the unlimited winners both of the 16+ entrants used a lot of what look like non-kit parts. Which still validates my question as to what point was a model 'disqualified' by the judge for having less than 50% kit parts?