We used solid oak beams restored, had to get pillars built into walls to support the weight of the beams. They look fantastic, everybody comments on them and they create a real homely feel, really suit a country kitchen style.
I don't know about doing it the way you mentioned, my thoughts are, if you are going to do some feature like this, best to spend and do it the right way. Nothing worse than cheap imitations. Features are such because they are the main 'feature' in a room. The wow factor.