Funny you should bring that up! I am about to make one - I envision a base with 2 uprights, slotted to hold the arrow, the base would be about 8-10 inches and the uprights , maybe 4-5 inches. I think the height would also hold the arrow for wrapping the fletching. The base would really be determined by how long your crest is. Not fancy by any means, but a heck of a lot cheaper than $140.00!
Hawkdancer