Prestashop 4 step checkout (no need "delivery", and changes at "address" step)

Hi, first, sorry for my bad english. I used the google translator. But i hope, you understand me. :-) I want to build a new Prestashop and there sell virtual goods / services. (Minute packages) I use the latest version Presta Shop (1.6) and the default (default-bootstrap) theme. The customer should specify when registering nothing except his e-mail, password and phone number (mobile or landline). I have to use checkout system from the 5-step. But I need just 4 steps. 01. Overview ==> 02. Sign ==> 03. Address (rename it to "phone number") ==> 04. Method of Payment At step 03 address, you can already enter his phone number. By default, the client must already enter either a cell phone or landline number. This is perfect. That may be so. But all other fields there such as Name, address, zip code, etc. must get out. In this case, the query must be borne in mind that this is not mandatory fields are more. But one can relatively be uncommented. This works well so far. According to his own try, I have already stated, but that it will take several "dummy" data. Every customer can / should, for example, simply called "User". (To top right "User" as the name is). The system also requires seemingly "id_country". So the country. (In the case of "Germany") and zip code. The zip code can also recover hard code "00000" be everywhere. I am happy to help with in the whole work. Test and share my experience. I have already done some preliminary work and the mandatory removed during registration. The main work is in the "Address" field and remove step 04. delivery. My recent changes you can see on "[login to view URL]" (without the "www"). Just a test application perform. I'm looking for someone who can put me up to a maximum of 70$. And best even with Prestashop has experience. I would like to do the whole as soon as possible. Because actually it is not much work. If anyone can make within the next few hours and everything works, I'll pay a little bonus. For more details simply write to me. I am also available via Skype (emrith90). Many Thanks.