A few of us has privately tossed around the idea of a "XXL" which is a single-place, full VW-powered Eagle.
One option would be to build a narrow DE but that would include structure (weight) that isn't needed for a single-place aircraft.
Another option is a beefed up XL to carry the additional weight of the full VW. As long as gross weight is held under 575lbs the XL wing should be sufficient if flown conservatively. The tail could be steel to offset the weight of the engine and provide some margin for slightly higher cruise speed.
At one point we pondered if the standard XL fuse would be strong enough for the full VW with the addition of some gussets. Another idea was to clip the XL wings back to LE span to increase wing loading and reduce stress on them since the XXL would climb nicely with a shorter span.
Lots of interesting ideas, and the single place full VW plane would be a nice performer.