Great competition! I'll join with my Ryzen 5 3500X (brand spanking used from ebay) and Zotac RTX 2070 Mini, MadMax-Frankenstein build
Time to take you on, [USER=1085]@guryhwa[/USER] 
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Really glad with above - my build is a few points higher than someone else's with same CPU - means my open Frankenstein doesn't impact performance or temps
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Case maker: myself, name: Lapdesk 
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Bounding box volume (rounded to 2 decimal places):
- 400.00 * 280.00 * 76.00mm
(including the sticking-out M4 screw on top): 8.512 litres
I could have replaced the legs with M4 posix screws and pretend it's a vertical build... but let's not take ourselves too seriously.
I'm not counting the hinges and the screen, though - a PC wouldn't have an integrated screen anyway... give me a chance here.
1st calculation: ((6797 * 8679) / (8.512^1.5)) / 100 = 23,754.152
2nd calculation: ((6797 * 206.12) / (8.512^1.5)) / 100 = 564.144
If I re-arranged hardware more efficiently I could get volume down by almost 2 litres, but wouldn't be useable as a laptop. Still huge looking at other examples here, made me realise how small your SSF builds really are!