20/25 - first impressions: looks good, but on closer examination it's got some flaws
35/50 - looks: has the look of an ultralight alright!! The main fuselage is just blocks, and the front dash I guess you could call it is kinda just plopped there. The engine details tho are amazing, I love the look of the engine. The back structure looks kinda thick, could have been thinner.
85/100 - flight: flight feels really good, stall speed is acceptable, but if it could be lower it would be better. Overall the flight experience is fun, trim is needed, but it's not bad. The plane looses speed quicker than it should, it should have a slow speed loss, drag could have been more towards 160-190.
20/25 - details: engine details like I said are amazing, love the look of it. Would have been better if you could have made the wings have custom control surfaces and all that. The primary wings are blocky, should have been smoother, with a more traditional wing shape.
35/50 plausibility: it could be plausible irl, but it would need alot, like better looking fuselage and all.
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So first off sorry I haven't given your score in a while, it's just I've been busy and well I honestly kinda forgot about the challenge, so sorry for that. This is honestly a fairly good aircraft, just some things I think could be better, like the engine hp, 155hp is WAY to much for a single piston engine, it should be more like maybe 30 tops.

Final score:195/250 respectable, but definitely could have been better.
Please pin this comment so I can find your score easily