I know I'm a bit late to post ... BUT incase anyone else was to read this - I made a Digger like truck/tractor for my daughter's 2nd birthday earlier this month.
She had a Bob the Builder themed party
I use the chocolate packet cake mix from the ALDI food shop
(about $1.39 I think for each pkt... Cheap$$ !!!)
I used two packets as I made two in a log tin !!!
... And decorated with the buttercream mix out of the WW kids birthday cake book from the 1970's (was DP Mum's book)
(I added cocoa for the chocolate flavour).
**** WAS YUMMO !!!!!!!!!!!
TANSTAR hope you had a great party today
... Let us know how the cake turned out !!!!!!!!!