OK then
woodnthings: TS is not feasible for the project. The project would be roughly 80" x 24" with a variety of different angles, which is why I am looking for a machine to take to the project.
Do you have the "project" built yet? If so, a photo would help a lot. In any case, I see a router and slot cutter as the only option. The "variety of angles is a bit perplexing, but could be overcome with some imagination. Even the "impossible" is possible with enough time, money and guidance from above..... :yes:
As long as the angles aren't too much greater than 90 degrees assembled, it will make it easier. I see a guide for the router in a parallel track, open underneath for the work with a bottom surface to rest the piece on for support when clamping. I see the use of toggle clamps or wing nuts to apply downward pressure to secure the work.
The work would be free to adjust to any angle in between OR there could be stops for repetitive angles. I would prefer the work to be assembled before putting in the splines if possible, the splines just adding additional strength.
Specialty jigs like this may never be used for any other project, but once you get it thought out and built it makes the whole thing so much easier. Been there, done this. :yes: I may be able to sketch up a drawing of my concept for Ya....