ORIGINAL: BMatthews
Most of the plans Randy published that you are looking for are now copyrighted by the magazines that published them. So kitting them would more likely require talking to the magazines and not Randy's family.
It would depend upon what rights were purchased. A lot of times, magazines buy "serial publication rights", sometimes they buy "all rights". If they only purchased the "serial publication rights", then the magazine doesn't own the rights for kit plans. Again, it all depends upon the agreement between the magaziner and the plans maker.