RCM has a set of plans for the Spacewalker 60. The plans are # PL-1032. The plans are $31.00 The web site is
www.rcmmagazine.com
You can also get the cowl for the spacewalker from fiberglass specialties for $41.00
http://www.fiberglassspecialtiesinc.com/
They also have the windshield blank or you can probably cut it out of a 2 litre bottle.
A scratch build would be a really good father daughter project and both of you will learn a lot. Start out by copying or tracing the plans to make templates for all of your parts. Order your wood and put on the coffee pot. Take your time and enjoy the bonding experience.

If you don't feel comfortable cutting out all the wood, you can look for a good laser kit cutter and get them to make a kit for you.

Other than that Sig has a 1/4 scale kit for a 90 size engine. Or the Sig Astro Hog looks close, you can probably change the wing tips to make it look more like the spacewalker.