TA Metalworks in Canada manufactures a quality extruder for a good price. It looks very similar to the Bailey 4" extruder. I've sent you a PM with additional information and links.
Regarding slab rollers, you may want to search the forums as there are several posts on building tables for the Bailey slab roller. Bailey will send designs upon request - you will need to specify DRD or DRDII because they have different builds. The designs contain enough information to build a table, but they are not full construction drawings so you will need to determine a lot of dimensions yourself. Please note that the DRDII slab roller requires different table heights on the feed side and the output side of the machine, and there are some pretty tight spacing tolerances between the table tops and the rollers. In my opinion, this is not a project for a novice wood worker. I ordered a 24 inch DRDII (machine only) and had 2 tables built for it (one small one for the machine itself, and a larger work table to receive the slabs). I chose this approach for added functionality/flexibility, because I wanted to be able to roll the machine into a corner when not needed while having a general work table in the studio. This was more expensive than ordering the table from Bailey. Factoring in cost and time, I'm not sure you end up saving much by building your own. table (even a simpler one), especially with the recent spike in lumber prices.
