Self-launching (electric) motorglider, configuration and performance question

[JLS]

Cross section of fuselage is enlarged by spar and position of pilot, passenger, side by side
semi-reclined seated.

What is your opinion about this configuration as cross section of fuselage is a question of
performance ?
Note: fuselage is 1.7" taller than Europa XS-Liberty XL fuselage (which XS version is a
motorglider). Other classical motorglider configuration is with cabin forward spar (as phoenix
motorglider).

[JLS]

Albeit a counterintuitive task, playing with polars (airspeed/rate of descent and lift/drag coefficient)
gives you a glimpse of a glider performance.

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N.B formulas come from here http://www.dept.aoe.vt.edu/~lutze/AOE3104/levelflightperf.pdf