Another option is the Chip Hyde Vision 3D... 85" wing, 1420 sq. in. of wing area and about 16.5 lbs or under... You can even play around a bit and mount the tank on CG.

Designed with a pipe tunnel under the plane and a specific header from DA is available for this setup...

They are too new for many reports but the video is pretty awesome as far a 3D goes... Chip does a little IMAC flying in it too... 8 point rolls... knife edge circles with half rolls in between.

I have one here that I stripped the covering off of to recover later this winter... beautifully design and built.