I'm going to be building an 8x10 enlarger when I build my new darkroom later this year, and the enlarger will basically consist of a light source (yet to be designed, but something like the one Adams shows in his darkroom...can't remeber if it's in "The Negative" or "The Print") and a Korona Pictorial View camera that I purchased and rebuilt. I have a bunch of process lenses and will play with them to find which ones work well for enlarging.
For the negative holder I'm going to try to build something out of springs and clips that will hold the negative tight without having any glass involved. (Bruce Wehman shows one on his web site in the Tech section under "Corner Pull Negative Carrier".)
I'll probably use some form of flourescent for the light source, and use Ilford 6x6 filters behind the lens for contrast control.