I had an Integral that I specifically requested to be made very light when I ordered. My sales rep at the time (Jason S.) probably helped out in that regard, but the plane (stock scheme with some color mods) was 4760g RTF with 5000's, pletty etc. Very light plane, flew really nice. So it is possible, just work with your sales rep when ordering, you may have to wait longer since the plane will be custom, but it didn't cost me any extra. It would allow you to be less picky with equipment selection.

The Int's had a bit of a history of being right at the limit, so when John Fuqua weighed it at the '08 Nats he had to look sto see what batterie I had in it lol.