Thanks for the comments. I had a blast making this.
List of materials are as follows. Materials purchased from Home Depot.
Outside rail: 070673863561 Capwhite867 8' $2.67 FRP/TILE CAP
Inside rail : 070673858864 DVDWTE855 8' $2.67 FRP/TILE DIVIDER
Luan or 1/4" Plywood
Wood Glue
Paint or leave natural your choice.
I just played around with arranging the cars until I liked what I had, then glued down the dividers.
Hope this helps.
Ann