It's really freakin old. From my mom's parents house. We like re-staining stuff, that one needs to be stained. So to answer your question, it's wood, probably Oak, still reletively strong.

 looks like its been through a century, oh your trolley is sick too haha

 Thanks. More weight/size = smoothness, even on a rough surface. It's for a 14 ft jib arm.

 That tripod will be able to stand up to the amount of counterweight you'll need for a 14' jib?

 The jib mounts directly to the tripod itself after the tripod head is removed. The tripod head is then used on the jib arm. It's a big tripod, picture does't really show it though.

 Cool. You should add on some bearings so that you can turn the dolly if you want to...

 Building a setup that allows me to turn a wheel (rotate, pivot, whatever) at the moment is beyond my designing capability. This was a rush job, we need it for a creative music video that requires a very long, slow, straight shot in this case. But in the future, I might use this same frame and incorperate something similar to what you're talking about.

The purpose was to also use it in a grassy field where all we would have to do is take planks of wood with us and presto, you wouldn't have to worry about the wheels needing to be perfectly straight so they'll stay on the 'tracks'.

 actually nevermind, 15lb jib arm and 4lb camera wouldnt be that heavy to throw it off balance

 On uneven ground yes there is a possibility. In the likelyhood of un-even ground, we adjust the tripods legs to compensate (as long as the ground doesn't fluctuate, then a jib dolly would be pointless w/out tracks) Plus, because we have it going straight (it can't turn or anything) is so we can possible use it at slight speed, indoors and outdoors.

 The jib is 40 pounds without the weights, tripod head, and camera. It's a real jib, very stable and structually strong for much heavier cameras that go upwards of 15 lbs. We are using it with DSLR cinematography. So a 5D + 70-200mm lens is as heavy as the stuff we're using. Plus a Z7U from time to time.

 40 pound jib?! actually nevermind I misjudged how big 14 feet is

 Bottom line, cant wait for your work, good luck

 One of these: www.ezfx.com/video

 that footage they got is unbelievably smooth

 Hey man. I'm really busy today, gotta knock out homework. My weekends have been taken over by all this video stuff.