i,m sorry but i don,t understand what those prices are referring to ?
all the chassis plates are available from 3GE, a forum member on here & as you are registered as a forum member you would get a discount, all the parts are made to book spec & lazer cut & very nice quality.
sorry i can,t do a linky but hopefully someone will be along soon with a link for you.
cheers
andy
i,m too slow at typing... as Bonzo,s link , thats where to get the plates