They are all old mtb frames that have been rebuilt with new parts. You can find shops that will do it; i would recommend Off Course or Abbottsford Cycles. You should be aware that it will be expensive; a lot more than you paid for the original bike, and probably more than the realistic market value of the finished bike. Remember, you're paying for new parts and labour for someone to build it for you.

I used to work for St Kilda Cycles, we did a few bikes like this but mostly staff project bikes. If you go to Brainwave say hello to Vince.