Much more to report on...
Plans call for a 3/4" thick 4''x 8'' Balsa nose block epoxied to the bottom of the fuse just ahead of the landing gear. I'm opting for this nose block to be removable which is why you see ( photo #1) the additional framework clamped in place, it will be held using four 4-40 cap head screws.
Next I glued two Basswood cowl mounting blocks ( photo #2 ) to the right and left hand sides of the firewall, more on that later.
Photos #3-8 show what I came up with to hold the ignition module against the firewall. I bought a piece of 1/2" aluminum angle stock at my local hardware store and cut two pieces the length of the ignition box. I drilled several 1/4" holes down the side of each bracket for two reasons, one to save weight, and second, to zip tie the box against the firewall. Two small #1 Phillip head screws hold the brackets in place. I made sure to countersink the holes so the screws will sit flush against the bracket. Photo #8 shows the module temporarily held in place with only one zip tie, two will be used in the final installation along with a piece of foam beneath the module.
The rest of the photos show some of the steps I went through to get the cowl fitted. There is no secret for fitting a cowl, except that you have to take your time, take small cuts and constantly keep rechecking for fit. If you don't take the cowl on/off at least 30 times (I may be exaggerating) you're taking chances cutting off too much at one time. In the end, if your measurements were accurate you will not end up with any unpleasant surprises.
I am using the stock Sig supplied fiberglass cowl. There is no need to buy a cowl, as the quality of the one supplied in the kit is excellent. If you are in need of an additional cowl, I suggest purchasing one from Fiberglass Specialties.
http://www.fiberglassspecialtiesinc.com/
Safety note: Be sure to wear a good dust mask to prevent inhalation of dangerous fiberglass dust while cutting and grinding your cowl! I usually have my shop vac on with its nozzle pointed at what I'm cutting to help keep the dust at bay.