so i'm still unpacking at the house so i haven't had much time to try anything, but i found these online while searching for some car stops so i don't hit the wall when i do get the car in there..lol. not a very deep garage either. i think these would be what i'm building out of wood. same concept and easier to just drop $70 and buy one. would last longer. i'll be measuring this weekend to see if it would work.
http://www.discountramps.com/speed-hump/p/DH-SP-22M/