A few good ideas here... I like the size class idea, can't tell you how many times I see excellent examples of 500/550 up against the hands down favorite 750.
For your consideration, I like that , never know who has what or how many or what they may have done to it since we saw it last, sounds interesting.
What might these kind of changes do to the calender ? Will there be a bike of the month or bikes of the month?
Whatever happens , we can't loose BOTM. Not just because I like it , but because every member featured each month has raised the bar over the years. when I first got here members were working on combinations of newer front ends for example , concentrating on how the best way was to upgrade older forks and maybe some better shocks. Now it's forks from recent machines , mono shock swing arm set ups, and improved engine upgrades, turbos .... the quality of upgrades and workmanship here has morphed these old machines into something more than what most of us could expect . Here, we all see somebody doing something new and different to these 70's machines every week that becomes the new norm, the next thing that we want to do to our own machines.
And when I'm sick of looking at Cafe racers, there's always someone doing a spot on restoration just so we don't forget from where it is we came from, or someone taking pride of an affordable upgrade that can make a difference in ride or handling, or the non winners of BOTM, the guys who have done excellent work to the machine they obviously love to make it their own and welcome the chance to show it off, even if it doesn't win.
For me, BOTM is a slice of life about the machines and the the lengths people will go to improve their ride. Gonna be hard to improve on that....doesn't get much better than that, does it?