Is the seller of the DIY kit on ebay called mark S 5000 or something like that?

yes, the guy is mark and i buy it on eBay . it is a very good guy and ask me every answer during my porting process.  it is not a easy job , it tame time and you will need many replacement bit for your dremel, i suggest to buy  a air tool that is far better than electric dremel. that take  me about 6 hour to complete the porting.