IIRC Retrospection v5 was already in testing more than year ago so I'm not surprised that an actual version is 6. AFAIK The v4 was the last version released as simple downloadable archive. Now they work in Dropbox cloud. You have to synchronize your Dropbox folder with their and you always have the latest update (if you want to be a beta tester just ask about it on their StarRover forum and eventually they'll give you all the needed stuff). I've tried to do this and failed. They work on Russian version of the game which doesn't cooperate well with English version. But it was more than year ago and maybe it's easier now (or maybe you'll need Russian version). Retrospection has a lot of EVE ships so it may save you a lot of time
About collision spheres - this remind me something. You've asked about lots of "?????" that imd plugin shows. IIRC some of those options are about importing/exporting collision spheres. You've probably already figured that out but.. I'm trying help as much as I can. I'd like to remember more.
P.S. Don't forget to post more screenies of your ships
. Higher resolution would be nice too.