hmm thats a good point, All i can find about that is this:
"No art recycling, your entry has to be new and made specifically for this contest"
Which i thought meant you couldn't just submit a fully finished character that you have already made.
But a quick search revealed this:
"ah, no sorry man. the main thread indeed doesn't say it ( maybe now it does) but in the comment section this was also asked and anwsered with a ''no, original art only, should probally have said that'' -marc. so as you can see, that is a no and no premade pieces either, so if you are a fan of your own kitbashing you need to make a fresh batch for this contest."
So i guess thats the end of that..