Just a note that a few months back I posted "the source" for the PR56 igniter that I've tested with GOX/kerosene.
There is a dimensioned drawing of the igniter body as well as a detailed write-up that includes parts lists and operational notes. If you make one or use it as inspiration, I'd love to hear about it via email or comment.
I'm planning on revitalizing the blog over the next few weeks, so stay tuned.
Here is a larger version of an actuated valve assembly. The first version is based around a 1/4" Swagelok valve (SS-4P4T). This version mates a 3/8" SwageLok 1/4 turn plug valve (SS-6P6T or B-6P6T) to a Hitec Standard size servo.