I don't have the two sets of plans in front of me at the moment (they're in Japan and I'm in Southern Cal) but the Spievack plans are, IMHO, both closer to scale AND much more detailed. The Polapink plans seem pretty minimal to me (I ordered them from AZM at the 1/6 scale).

I haven't really thought about the differences between the two in terms of easy of construction. They seem pretty similar to me in this regard.

BTW, I didn't say that a kit is "a bunch of pre-cut parts" -- often they are more of a box of WOOD that YOU still have to cut (and shape). Really, all you'll get from a cutting service is a set of ribs and formers and maybe a few other bits like wing tips. In other words a "short kit." Don't expect a build-by-number Guillow's style kit. The Flair kits are pretty all inclusive but they definitely require that you "think through" the build.

Still, I think if you have managed to build the Funaero DIII you probably have the skills needed to build from a set of RC plans.

And $500 dollars seems absolutely outrageous!