The Gull with 20' wingspan is 248 lbs with the Hirth 33 that is 45 lbs., the Soaring Gull with 28' wingspan is 254 lbs.

The weight of the HKS 700E is 121 lbs, so just can't be done and still be 103.

That sweet panel is probably 10 lbs over standard, but that weight could be easily negated by switching from the Odyssey PC680 AGM battery at 16 lbs to lithium at 2 lbs, so transponder, VHF, and all the goodies in that panel could stay and still be weight compliant.

But the engine, well who wouldn't want a 60 hp 4 stroke in a 103? Even with the weight savings of a more modest panel (10 lbs), lithium battery (14 lbs) and hand thrown parachute instead of ballistic (16 lbs), that is a 40 lb allowance for an engine that weighs 76 lbs more than the spec engine.

However could still have that panel with the increased performance of the Polini 250 engine and save 2 lbs over the Hirth 33.

Hirth 33 28 hp @ 6500 rpm 45 lbs

Polini 250 36.5 hp @ 7500 rpm 43 lbs.

Rate of climb at standard conditions sea level for the Hirth 33 is 850 fpm, I would guess the Polini might nudge 1000 fpm, not bad for a 103.