Storing them outside is definitely a possibility, but I would MUCH prefer to find a way to do it inside. especially because I think I could use the storage-under-bed platform to keep all my other gear, leaving the rest of the van free.
anyone know the interior dimensions? I thought I read awhile ago about 7ft from the hatch the the rear of the driver seat, no idea if thats correct. but my bikes about 3'9" long with no wheels, and 5'1 with a rear wheel. if 7ft is correct, that leaves me just 3 feet x the width of the van for a little kitchen area and whatever else. not much but I could maybe make that work, especially if I got creative with integrating stuff into the platform/storage area, and/or got creative with folding stuff.
Other option is to do a fiberglass high roof, and build storage more vertically.
If I can find the interior dimensions I think that will really tell me what I'll be able to do.