original SIG Rascal 110 was to little for me , and I start to build a 141 inch (3600mm) wing span "my own" RASCAL.
exactly, my plane only "looks like" RASCAL, because a construction is fully independent of SIG kit's.
it has a 2 spar wings, detachable 1550mm consoles and non-detachable 500mm middle-plane.
target was a 6-6.5 kg all-up weight at electric version, or 8-9 kg 50cc gas version.

here some pictures of building process (electric version):

http://forum.rcdesign.ru/blog_attach...3&d=1263939318
http://forum.rcdesign.ru/blog_attach...5&d=1271531039
http://forum.rcdesign.ru/blog_attach...7&d=1271528665
http://forum.rcdesign.ru/blog_attach...1&d=1272026029
http://forum.rcdesign.ru/blog_attach...8&d=1272029578
http://forum.rcdesign.ru/blog_attach...5&d=1272222227
http://forum.rcdesign.ru/blog_attach...8&d=1272631357
http://forum.rcdesign.ru/blog_attach...7&d=1273321645
http://forum.rcdesign.ru/blog_attach...4&d=1275327040
http://forum.rcdesign.ru/blog_attach...3&d=1279732412
http://forum.rcdesign.ru/blog_attach...5&d=1279910591
http://forum.rcdesign.ru/blog_attach...5&d=1281094941
http://forum.rcdesign.ru/blog_attach...6&d=1281207852

now I need just to complete a covering and install a motor and radio gear.
approximated all-up weight is 6.2kg

WOW that looks good and not to mention it size 

I also have a "my own" 59" (1500mm) version for my son
http://forum.rcdesign.ru/blog_attach...3&d=1277233641
also need to cover-up
wood parts weight is 234 gr

Awesome Build! Did you user a laser cutter to make the "kit"?

Yes, a local laser-cut service.

I thought I saw burn around the edges... Makes kitting much nicer!

here is a covered console
http://forum.rcdesign.ru/blog_attach...6&d=1281207852

That looks great. I love the rascal 110 and have always thought 12' version would be nice. Whats the power going to be, 30cc?

The best thing about my rascal is that I can thermal it up there with the buzzards.
Edwin

looking great.... is that UC transparent Orange? This is my Rascal in UC Cream and Transparent Orange. Looks great in the sky.

my power set-up is electric, 2.1 kilowatts or little more.
for 6 kilograms weight 1800 watts is enough. 30-50cc gas engine can be attached to, but gas version must be a little havier, for 1-1.5 kilograms.

covering is SOLARFILM Polyester Supershrink LITE orange and white.

What size battery packs will you use?

only "to try", I have a 4AH 7S1P pack, it can works about 4 minutes at full...

http://forum.rcdesign.ru/blog_attach...6&d=1282161656
glued tail.

only wind screen and radio not installed yet
http://forum.rcdesign.ru/attachment....0&d=1283972229
http://forum.rcdesign.ru/attachment....2&d=1283972267
http://forum.rcdesign.ru/attachment....3&d=1283972274
http://forum.rcdesign.ru/attachment....4&d=1283972281

before- and after-test flight photos here
http://forum.rcdesign.ru/blogs/2452/...l#comment37658
it flies at half throttle and land very slow, nice steering and gliding.
power-to-weight ratio is 0.85, ready to flight weight is 7kg.

here is first flight video
http://www.youtube.com/watch?v=yTq0DLnfwJU