Their is also a reason that motor mounts that are adjustable with idler pulleys are way more expensive. DIYEboard is produced for the masses. That means if you want it customized you have to do it yourself or pay the big bucks for a builder to do it for you.
I love DIYEboard stuff for what it is. Great intro boards and a super affordable price. If you want stuff that is adjustable and can be easliy modded to have idler pulleys I would check out TorqueBoards 218mm trucks.