Product reviews for Arup S2 'Heel Lift'

The instructions suggest this is an easy assembly, I would tend to disagree.  The instructions suggest building the wing upright (vertically) balancing the wing ribs on the leading edge, with the ribs sticking upwards.  This may be possible if you knew the centerline of each rib – but unfortunately that is not provided.  An alternative approach would be to supply tabs on the ribs to build it horizontally, but again none are provided.  I opted to build it horizontally, by adding my own tabs to the ribs, which worked well.  The second issue is the suggestion of bending balsa around really tight curves to form the wing spars, I tried multiple times, ended up distorting the wing profile and snapping he balsa.  So I opted to add separate balsa parts and then sand them to the right profile – much simpler and significantly less stress on the wing.  The third issue is adding the trailing edges, which again has significant curves, after two attempts I got this done, but have now noticed a warp in one of them so will have to cut off this section and redo. Again this could be done much easier by having a laser cut shaped Trailing edge notched into the wing ribs.
From the size of the servo’s I suspect this is an older design, it calls for servos to be mounted to 2x snake connectors which go through the wing and poke out underneath the wingtip ailerons.  I have opted to add two smaller servos mounted in the wing tips which directly connect with the ailerons.
The scale machine had full moving wingtip controls, on this model for stability reasons they have been changed to fixed leading edges with trailing edge ailerons.  I couldn’t bring myself to deviate from the scale machine so opted to put fully movable ailerons, - which may end up being my nemesis.
This is not a bad plan, and it does look pretty neat, but it is not a simple build, and probably requires someone who has done this a few times before.