Suggestions for gym site

[CMSmonkey]

Hi Everyone,
I am building a site for a client's gym site. Here is what they are looking for:

- member can register online by the month or yearly for their membership
- member can update their contact information through their My Account page
- if a customer wants to walk in to the gym and sign up, the admin can login to the admin panel and manually add the member
- if the member wants to pay their monthly fees when they walk into the gym, the admin can login and update the client's account
- admin can also easily view who is dilinquent on their monthly fees

Is this possible with CMSMS? I've worked with FEU, Self Registration, CGMyOrders and CG's e-commerce suite before and know some elements might work, but wasn't sure if it would work without extensive customization.

Please let me know if you have any suggestions.

Thanks in advance!