Um, here goes.
Aikido Shudokan teaches Yoshinkan Aikido.
The head instructor is Sensei Joe Thambu, 6th dan IYAF.
It has classes 6 days a week. Lunch classes at the main dojo are general, and there are "junior" (5th kyu and below but you'll usually get some yudansha) and "senior" (4th kyu and above) classes every week night and on Saturdays. Ranks starts at 9th kyu, so some of the "juniors" have still been training for a little while. The smaller satelite dojos hold classes 2-3 days a week.
At a guess, there are probably 60 or so adults regularly training at the main dojo, and another 20 or so between the satelite dojo.
The main dojo is about 9-10 tatami long by 9 wide, so a fairly large mat area.
As for hakama, students don't wear them, even yudansha. Only the instructor gets to wear one. So maybe not what you wanted, but at least an even playing field.
Not sure how many schools in general will let you dictate your own dress code though...
If you want more info, try www.aikidoshudokan.com