Hi Rich,
Let us know which way you go for the windshield on your new F3S. Note that the used F3S Repo bike that I tested and bid on had a huge F4 Customs windscreen. It worked reasonably well, but was so big it that it looked out of place on the F3S. It had fairly good wind protection, but I don't think the wind protection was any better than the much smaller Madstad adjustable windshield I put on my 2009 GS, and, the buffeting and turbulence at helmet level were not as good with the giant F4 screen. Motorcycle Dave, a sponser here, has just picked up the Madstad products by the way. Nothing bad to say about F4 Customs, but these screens are subjective to the rider, and, they work differently on different bikes. Things like handguards, etc., all affect wind flow and turbulence. I think that is one reason the Madstad worked so well on the 2009 GS. It is very adjustable for both height and angle, plus, there are 3-4 different windscreen heights available to help optimize the performance for the rider. Note that I took a BMW R12S with a Madstad adjustable screen out for a test ride several years ago. I couldn't make that screen work well for me at any setting with respect to buffeting and wind noise. On the other hand, the BMW water cooled R12GS, with its small but height/angle adjustable stock screen provided clean, turbulence free air for me at six foot height...In any case, you should be able to improve the wind protection on the F3S markedly.
ISCI is a custom fab machine shop company that has been making a very well done (but $$$) handbrake kit for Spyders since the original Spyder RS/GS came out. They still have these "bolt on" kits for nearly all Spyders, included the F3 series. Here is the link:
https://isciride.com/products/hand-brake-system/
I installed one of the ISCI floorboard kits on the 2009 GS, primarily to help my son who wears a prosthetic left leg, ride the bike more safely. The quality of the ISCI products, including how it is packaged and shipped, is impeccable. I have never seen such attention to detail! I have heard nothing but good things on their handbrake kits, but have not seen one first hand. I would like to have one on both bikes but the $$$ keeps me from this. Why CanAm can't see fit to provide this from the factory is beyond me. To me the Spyder is more like riding a snowmobile (which Can Am makes by the thousands) than any other type of vehicle. Haven't seen a snowmobile yet that relies on a foot brake...Just rolling the Spyder around, or loading/unloading on a trailer illustrates how useful the handbrake could be.
There are several good posts throughout the years on Spyderlovers that feature hand brake upgrades that the owners have engineered, and most of these are very well thought out and done, and, and a huge savings over the ISCI kit. But one has to have the time and ability for this. Not being retired, I barely have time to ride and maintain the bikes.
Here are a couple of links from a few years ago that have good information on owner engineered handbrakes. Note that these links have more links within, so can be a good source of information and understanding of how these hand brake kits work in conjunction with the factory braking system.
Link:
https://www.spyderlovers.com/forums/showthread.php?127983-ISCI-Hand-Brake And another link:
https://www.spyderlovers.com/forums/showthread.php?93062-Hand-Brake&p=1232376 And with searching there are more. With your work on rebuilding vintage racers, you have a headstart in this area.
On the Suzuki GSXR1100-based racer, I believe that's the older air cooled I-4 motor. My brother has built one of his open class hillclimb bikes on that motor, and also has built from scratch, a really nice GSXR600 (water cooled, later generation motor). The 1100 is a beast power wise. He has replaced the GSXR600 with a GSXR750 (its a "big bore" 600)...which is much faster/more powerful than the 600 and nearly as fast as the 1100. These are really good engines that see use in midget race cars, hill climb, drag race, and of course road racing.
Have a great day,
Rod