Baltic birch for the initial test, then aluminum would be my choice for this purpose. It cuts easily on a table saw with a metal cutting blade (I didn't want to risk dulling my freshly sharpened carbide blade). I've built jigs with corian and it's great for some purposes as long as you are gluing it together or bolting through it. If you need to drill and tap a connector it's not so good and you will need HeliCoil inserts for a decent connection.