I am a tight wad and the Mrs. is even tighter so to keep everyone as happy as possible, the cheapest of materials are used. 1/2a being the smallest planes and only having about 90 feet of space in the back yard to fly, DT Foam Board is my best friend. I have built an Osborn platter, a profile white lightning and have on the table a full fuse and sort of built up wing White Lightning.
This one, a pseudo copy of the Musciano Golden Hawk, awaits the last few bits and the electric power I have used for all of them. Hextronik 2730-1500kv 12 amp speed controller, 6x4 prop and 370 lipo.
I love what all the competitors do on this site, I have learned a lot but are there any others that just like to put something in the air and fly it wherever without a pattern in mind?

John, a little more about the power stuff is in the post of the hollow log just a few below this one. It's all the same stuff. I use Dollar Tree foam board and depending on the plane I can build a plane or even 2 for a buck. The plane in the picture (Golden Hawk sort of) I used a KFm-4 type airfoil and attached the upper and lower portions of the airfoil with Elmer's contact cement. Found that little bit on an RC site I believe. The fuselage is just 2 sides, a top and bottom cut from the Dollar Tree Foam board and glued up with regular Elmer's white glue. I removed the paper from the inside parts of the fuselage and on the wing where it is laminated to save a little weight. I consider these models "disposable" while I am relearning how to build and fly. I cant seem to work on them as much as I would like as the Mrs. hates the things but does seem enjoy my company. 
One of the best things about the electrics, and I could list several best things, is how quiet they are. I was out yesterday with the White Lightning Profile for a couple flights in the back yard and the Mrs. never even knew the plane was flying just a few feet from the house. The dog doesn't even hear it!
I'm so glad I took the leap and got back into the hobby with the electrics. Now, to get a few of the 7 grand kids AMP'ed up about it!!

Major Grins Rusty, even just thinkin about flyin!!! 
 I have seen several of your videos and enjoyed them all. Maybe some day I will get to a point my flying is back to prime time viewing quality and post a video.

Yes John there is a lot of inspiration out there. This one may require a touch more than 1/2a power but total dry weight is only about 5 oz.
If nothing else, it will look cool flying!!!

Nice John!
Question for you, I just started working with the KF airfoils. Could you make a comparison between a flat, a KF and built up wing as far as how much difference there is in flight characteristics for a control line planes?
Thanks.

Well, the wind was way too strong for 1/2a but non-the-less I ventured out with the slabs of foam. (Just couldn't wait!!) Using the make-shift spin up thingy I was able to become airborne. The plane preformed well, better than I thought it would especially with the wind sending everywhere. I was able to go inverted, do some loops both inside and outside and even a couple 8's although they looked a little more like scribbles in the sky. It needs a little less speed so the next one I will place the lead outs a little farther back. It's unfortunate I found out that even only 5 oz of mass will crush the foam board sides in a free fall from 15 feet up. Half my flying circle is over water/a pond and the power cut with the wind just coming into my face. hummm..... let the plane drop or backup into the pond??
Yep, disposable airplane.  A new fuselage is already on the cutting table.

Having followed this thread, and ending up next to a Dollar Tree store I bought a sheet. WOW! I calculated the density and it is 3.88 lb/cu.ft.

That beats just about the most unobtanium balsa you could ever find! THANK YOU FOR FINDING THIS MARVELOUS MATERIAL!

My 8 year old neighbor wanted me to make her a Kitty Cat plane. Here's the foam board platter complete with whiskers, eyes and a tail I made for her. The paint is blue/purple metal flake color changing Rustoleum.
My son said it looks more like a tick.

Rusty