Hey, I'm a big Primus fan also. Claypool played Mr. Krinkle with a regular double bass, probably a 4/4 size and used a bow, probably caked with rosin. By the way, I think stand up is a bad word around here, lol. Anyway, I was in the same boat as you, I wanted a double bass really bad but just didn't have the cash for the one I wanted. I had my eyes on the NS Design that les claypool plays now. It goes for about $2879.99. I also looked into the dean but thought it wasn't worth it. It seemed like just a fretless bass standing on its end. I doubt that thing sounds anything like a DB. So, this is what I did. I searched the internet on building my own DB and found bob gullihur's website. He has a very useful website with lots of information on his own homemade DB. Here is the link.
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After some major brain-storming I went and spent 70.00 bucks worth of wood. Hard rock maple and bloodwood were my favorites, and just a small piece of ebony for the nut, bridge and cover plate. I am no luthier by any means, but I did manage to build my own electric double bass. check it out on this link.
http://www.talkbass.com/forum/showthread.php?t=163176
It wasn't really that hard to build, more time consuming than anything. and a whole bunch of filing and sanding. I have about $640.00 bucks invested in it. I didn't buy the cheap parts either. The most expensive thing to purchase was the strings right at $150.00. I used d'addaio hybrid strings. I also installed a double big twin piezo pickup and pure preamp by K&K sound, each around $100.00 bucks. I took the preamp apart and bought nicer pots for it instead of the little plastic pots that are not made for constant tweeking. It sits on a Pearl tom stand that ran me about 110.00. The hardest part was shaping my finger board, I just used a hand planner and started shaping. The whole thing turned out sweet. I couldn't be happier with it. It plays and sounds and looks awsome. You might give it a try. There's nothing like playing your very own homemade instrument on stage. A good place to start is with a premade fingerboard available at bob's website.
well good luck finding/making an EUB.
john