Jolly cutting ribs is easy. I trace over the rib pattern with a piece of typing paper for each type of rib needed. Then I make several copies on my printer. I cut out blanks of wood the right thickness and just a little larger than the rib. I cut out the paper pattern outside of the line. I glue this to one rib with contact cement. The I use T-pins to pin a stack of 8-10 ribs together and cut them out on my band saw. Its that simple. when all of one size of ribs are cut out I use a piece of wood the same as the spar size and mount them together and final sand to uniform shape.
Tom your models look really nice. If I remember right didn't Joe Bridi design the Sportster?
Like GB said by cutting your own you can shave off weight by better wood selection and by minor redesign of the kit. Its all fun.