I use an aluminum straightedge plus homemade plastic spacers to position it for the correct offset of the fence so the saw cut is on my mark. It is accurate to about 1/32". I always cut the panels slightly large and finish cut them on my table saw.
My "Odd" Planes: 607, 5 and 3 -- I bought the Bedrock 607 for $45 (left) and the #3 Bailey (right) for $22 in Chattanooga; the #5 Bailey in the middle I bought this summer from Ozzie-x for an undisclosed, but very good price.