Hellou.
Im programmer and front end developer with 13yrs of experience, specialised in osCommerce stores.
Your 5 contributions can be installed within 4 days, assuming that you have at least 2.3 osCommerce based store.
For 6 yrs I was working as lead developer in computer store, based on osCommerce engine, where i was installing, modifind, and creating on my own wide sort of contributions and modifications.
I was also moderator and later admin on biggest polish osC forum, so implementing contributions , even on heavily modified osC store wont be a problem.
If you wish to hear/know more, O'm here always to help even afer we close the project.
All the best,
Trygon eXtreme