customize Music box v2 to our needs

We looking for some one to design our music website with musicbox v3.5 [login to view URL] . We need to update few features according to our needs. 1) Download button will aromatically shows on auto addon. 2) Add download and play options in albums section like following site : [login to view URL] 3) Change E-Cart to Monthly and yearly subscription with unlimited download and play. 4) Three membership levels. Visitors, Free Members, Subscribed/paid members. a) Visitors can browse thru site, play/stream music. b) Free Members have full access to site, except download music files. c) Paid subscribed members have full access plus allowed to download unlimited music files. a) Visitors and free members redirected to subscription page when click on download button. I will pay $275 for the script, so please only bid for customization cost. If you have better for similar project solution feel free to share.