dclark wrote:So I figured the best thing was to use strips of SS. Should be at least as good as the aluminum and I know where to get it cut to length at little or no charge.
OK, sounds good so far....
dclark wrote:But there are a bunch of holes I'd need drilled for the mount screws ... If I do the drilling, I figure that'll mean about 4 days drilling, I'll blow through about 14 bits (home depot's finest, and maybe burn up a motor or two.
Huh? ...make a template (see below) and center-punch the drill centers, then use a drill press, or a good electric hand drill, take it slow (about 450 rpm sould be OK on stainless*) and use plenty of drilling lubricant... you should be just fine! Take it slow, apply steady moderate pressure and
"let the drill do the work", as my Dad used to tell me.
(Oh... and his other standard advice also fits here...
"with all things in life, son, proper lubrication is the key to success." 
)
dclark wrote:Or I could have the shop drill the holes in a matter of minutes. I prefer option 2. But that means taking everything off so they can exactly match the holes.
Huh? (again)... why not just take some stiff cardboard and make a proper template of each part? Then either you or your machinist can simply cut and drill to the template's markings. If it's off by a hair or so it won't matter a huge amount since you'll be mating up to the core/glassfibre holes and that wasn't exactly a 'precision' drilling in the first place. I should think the important bit would be to make sure the holes are in a straight line... I haven't checked mine, but I'm betting that they are in a straight line and drilled on some regular pattern.. like every 4 inches or something. (If you really want to be anal-retentive about it, you could use some
blue Dykem (aka "prussian blue") and a scribe to lay out the material, then take it up onto the boat to match it before you drill.)
=============================================
*
The formula for determining proper cutting RPM is:
RPM =(12*V)/(Pi*D)
where RPM is the drill motor speed, V is the cutting speed of the material in fpm (which is 30 fpm for 410 Stainless), and D is the hole diameter, which I am estimating at .25".