....arms tired! Ya want a decent miter saw Jorgensen at HD,etc. makes one like in the link but about $40. The Veritas will cut picture frame quality miters, tho'. Instead of the MDF I make the frame from 1 1/2"X 3/4" maple, miter the ends and cut kerfs in them to accept 1/4" plywood splines. Really strong and easy to glue-up. Also thee are prettty good corner clamps available see my post about miter clamps. Rout a groove with a 2 flute upshear 1/8" bit. Then just use rubber screen spline you get at HD, etc. Push it in with a spline tool which is just a grooved roller. Heck, you can use a screwdriver or the back of a chisel but not the wive;s butter knife.