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this doesn't look structurally sound.
Best that you don't look at a Lotus 110 or TriRig Omni then
Losing the down tube is fine as long as you throw enough extra material at the top tube and seat tube. You have to add back the torsional stiffness you've lost from a straight tube running from headstock to BB into the much longer dogleg route, so it's very inefficient in terms of material use.
gbj_tester-
My old boss and a couple of colleagues helped develop the composites on the Lotus bike. It was a big step up in aerodynamics but they all said it was quite flexible.
2x2 carbon has a modulus of about 120 while something like 6061 has a modulus of 69 (according to Wikipedia). The section of that Fork Seatpost Clamp Included High Quality 700C Alloy Track Bicycle Frame Set Cycling Fixed Gear Bike Frame is quite small so it would have to be chuffing thick to make it stiff!
Jonny69
Spotted this on AliExpress.
I am not a structural engineer but this doesn't look structurally sound.
@mdcc_tester Stress test please...
https://www.aliexpress.com/item/Fork-Seatpost-Clamp-Included-High-Quality-700C-Alloy-Track-Bicycle-Frame-Set-Cycling-Fixed-Gear-Bike/32730386608.html?spm=2114.10010108.1000014.6.NzbYNI&scm=1007.13338.50051.0&pvid=ee06b32d-bbaf-4470-8b53-ed70b0faa980&tpp=1