There's a program called sPatch that can create *.mdl files with organic-type shapes. I haven't really worked with it much, but the interface seems simple enough. Should be easier than making tons of unions/merges/differences/whatever else moray does
You used to be able to get it on the moray site, but I think you can only get the patch to make it work with moray now (you'll need that too). A search on google should bring it up though.