Id say do it! it looks cool and is a conversation starter. I dont get from you that you need it to be super computer. As such, you can build it from older parts off ebay for a few hundred bucks. I wouldnt do it from new, top of the line pieces that you may need to return or RMA, at least not with your first attempt.
As for the oil, if you use mineral oil it lasts and stays clearer a lot longer than vegetable oil.