How light do you want to build?
Basic question on indoor Bostonians concerns the weight. If you want to build to AMA minimum of 9 grams you need to find plans for Bostonian Patriot by Larry Coslick. It's a lightly built lifting body type. I've found a set, but don't recall where I got it. If you can stand losing some time, but want something more robust, there are lots of 14 gram planes around that can be flown indoors.
I've posted some stuff about Bostonians lately on this forum, as has YAK52 from the UK, but the planes weighed closer to 14 grams. I described one of my planes derived from Typond's "Beancraft Banana" in Model Builder on a thread here.
I also started a thread on airfoils for Bostonians that attracted a fair amount of technical info.
I fly with the Bong Eagles, who've always had fun indoors with Bostonians in their category II site. I started with a Peck Bostonian Pup some time back.
Have fun flying