Hi Tony guys
Yes one of my favourites and can hardly wait to see one flying - a couple of years perhaps.
Some points for the conversation perhaps.
The engine was much modified from the DB unit and I believe nothing is useable/ interchangeable - from one to the other -
There are probably up to 4 Ki61s being rebuilt at Wangarratta by Precision Aerospace in Victoria , Australia - two for prominant USA collectors, one for Murray and a fourth unidentified owner.
Here are two links to my webshots pages (There are two seperate sites and you look for the Ki61 page in the first link
http://community.webshots.com/user/setter125
and Murray Griffiths in the second
http://community.webshots.com/user/setter126007
I believe they are going to rebuild Japanese powerplants rather than modify DBs to fit ?
A Ki100 would be possible fairly easily as some of these were constructed by taking unused Ki61 Airframes and mounting the Radial engine on them . There is only one complete Ki100 extant at Hendon in the Milestones (Sic) of Flight building and very nice it is too. The Ki100 could easily use one of a few suitable USA or Russian powerplants if a Japanese engine could not be sourced as with the La9 and Fw190 rebuilds
Regards
John P
Just my thoughts - not gospel