I'm sorry to hear you will not be able to complete this build before the contest ends. I hope we see it completed later.
BTW - you expressed some interest in the the 7TP I am building so I thought you might like to know that WAK has a new kit. It looks like they also have laser cut frames/wheels and laser cut tracks for it.
Wydawnictwo WAK - Wroc?awskie Atrakcje Kartonowe