Discussion: Components to convert dinette table

I am trying to convert the dinette table in my van to a tri-fold table. I have the necessary table top but I do not have a solution for the cupboard base for the top which would be fixed to the wall. I have been quoted $450 and up to $1100 to make the base up to making the whole unit. Can anybody point me in the direction of somebody who can make a decent cupboard base at a more reasonable price?