It seems that he may have had the plane up for sale. There is a web site that has all of the specifics ....
http://www.jackairllc.com .. and though the full content has been removed, the "cached" information in the form of the text is still fully stored.
It lists things like spoilers, max speed of 300 mph, TSIO-520-NB (300hp ??), Flint tip tanks and a fuel capacity of 163 gallons.
How would the combination of horsepower (he lists the top speed as 300), and things like the spoilers affect the aircraft. Here, I get fully lost; wouldn't it be SOP to have the spoilers out for a descent? The interplay between the engine mods and the tip tank/STOL mods?
You folks will understand what he had and it sounds like there was little held back in building this ship with the electronics like a stormscope etc.
The posted link did not work ... but ... just Google in .... riley super skyrocket .... and it will be a few from the top and you can see the jackairllc tag .. hitting the cached feature will bring up the text.