How good is a modified 1970's Martin D18?

This video is going to challenge you!!! First of all, it's a "blind" listening test. You don't know which guitar I'm playing, when. You'll have to listen and make notes. I do reveal the guitars at the end, so feel free to use the Chapters to skip around if you find yourself limited on patience. I compare a fully modified 1972 D18 with a 1945 and 1949 D18. Then, a quick comparison with a 2015 1939 Authentic at the end. (00:00) How this is gonna work (02:53) Blind A/B/C (10:26) The reveal! (14:00) Struggling for a favorite (15:25) E-chords (17:36) Blackberry blossom (19:48) Wild horses (21:45) Am noodling (23:40) Necks (25:20) Hybrid picking (28:15) Tarnation testing (32:10) Snap Crackle Pop (35:00) The '72 has game (38:30) Headstocks (39:40) 70's tops (43:00) Hide glue (44:00) Quick A/B with '39A