How to make a compact Tippmann?

So I've got a tippmann 98, and i hate how bulky and back heavy it is, I saw on www.98og.net a couple of good Ideas (http://www.98og.net/98-photo-gallery/4813-my-98-custom-9-custom-build.html , http://www.98og.net/98-photo-gallery/4658-spring-feed-air-thru-98-custom.html) the undermounted air on the "tippmann 9" looks good, but im not sure how to make a low profile feed system! The second spring-feed set-up only holds 10 balls! And ideas??