I don't know but wouldn't want to have to try it again though, not matter how many engines. That's got absolutely nothing to do with anything anyway. But there's much less criticism of any individual going on here than you'd perhaps choose to read into the posts. General discussions of aspects involving aviation failures, whether human or mechanical, require a process which involves both man and machine and to leap at discussion and call it criticism is a weak form of debate. At this stage it's not reasonable to speculate on pilot negligence. It might though, be relevant, intelligent or even amusing to establish on the forum whether the aircraft was certified to fly commercially with such a conversion. That's surely a fact that should be of interest to pilots as well as to the CAA? No doubt any inquiry will consider the details sufficient to enable it to determine that the aircraft was flown within its envelope. That would also then be a determined fact which might or might not reflect on the pilot who should be innocent, if only for the sake of his family, until whenever and if ever it is shown that he was not.