I've found a pretty nice set of plans for a 20" span rubber model, published in 1947 here:

http://www.theplanpage.com/esp/swift.htm

The plans are downloadable as a .tiff image, can be opened in Windows picture viewer, saved as a .jpg and then inserted into CAD as a raster image where they can be scaled and plotted on the 36" HP plotter I found the specs of the "real" Swift and plotted a 1/8 scale set of plans. Looks like a fairly simple build.....and the size is comparable to the electric Mini Pulse XT and slightly larger than the Parkzone P-51 (that with the stock Parkzone motor/gearbox and a 2100 Thunder Power Lipo was a MISSLE!). I should think the Park 450 would handle this one no problem.