DIY pump track

Has any one had an experiance building one? ideally out of wood, ie slatts or sheet wood not fussed.
anything i should watch out for, roughly how big an area?

liked the size of the DMR at the london bike show.

cheers

Do you want to build it inside or outside?

Like this..?

Or like this?

http://www.pinkbike.com/video/295556/

http://www.shoretrax.com/%5B/url%5D

hopefully rent/let a old barn or open face shelter so ideally weather proof. more like the one dmr built, then get be bpacked up and moved.
going to be a ongoing project.

scottfitz- i’ve seen that in dirt magazine. looks awsome. but thinking wooden as i could make in sections that could be taken out and add sections etc.

helps that iam a carpenter, so loads of off cutts.