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A dob rocker box is relatively easy to make. I've made several, and they all work beautifully. They are the heart and sole of the Dobsonian model, but if the Dob principals are not followed properly, you end up with a dog of a mount, as you're expirencing.
I've attached a few pics of the ones I've made.
If you are going to go down this path, the things you need to keep in mind are:
* the height at zenith you want the EP to reach.
* the centre of gravity of the scope, and if you need to adjust the location alt bearings to make it work better.
* the rigidity of the box. A flimsy box = trouble.
* bearing material selection. Teflon and highly textured laminates work best.
They are simple mounts to make. Do it right, and they are magic.
If you'd like to talk a bit about these mounts, I'm only too happy to help.
Mental.
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