Company in Ireland are doing it. I know one one place in the UK who are doing it for a member on another forum. I dont know what the name of that company is though.
The Irish company charges 1200Euro (About 1000GBP) to machine the bottom end and insert and weld the sleeves into place. This involves you giving them the bottom end completely stripped.
The good news is that you can use your standard crank. You will have to shed out on a proper set of Rods and pistons though and that aint cheap. Engine will require running in and mapping. If you can strip and assemble the engine yourself that will save on costs but overall its not cheap.
You get what you pay for though, and a setup like that can cope with turbo applications.