I know this thread is over a year old, but I have a question I can't find an answer to. I have a guy whose trying to trade me an HSD turbofoam viper. He says it's an early model , and the turbine access door is on the bottom of the fuse. Everything seems to be there for turbine use, but, for example, the turbine/pipe mounting brackets have a bunch of glue on them...not a factory looking install. The only vipers I've seen with the hatch on the bottom, are the edf'. Has anybody seen a turbine ready model of this jet with the door on the bottom? Or, could it be an edf that someone tried to convert to turbine use?.