If you don't want to watch the whole video, here's what to buy:
2x motors - I've done both M36N-2 and 555ph 18150 and prefer the 555 in feel but the M36N is easier to find.
Heatsinks and a fan
Butane torch/soldering stuff/dremel
That's it!
M36N-2 example - https://www.amazon.com/Powerful-MITSUMI-4500rpm-Biaxial-Generator/dp/B074Z2RJ78
RS-555PH-18150 example - https://www.airscootw.com/index.php?main_page=product_info&products_id=19326
heatsinks - https://www.amazon.com/Mirthobby-Aluminum-Electric-Heatsink-Brushless/dp/B07QXD5HP6/ref=sxin_15_ac_d_bv?ac_md=2-1-VW5kZXIgJDEw-ac_d_bv_bv_bv&crid=2VQ8AO5JX9NJ0&cv_ct_cx=rc+motor+heatsink&keywords=rc+motor+heatsink&pd_rd_i=B07QXD5HP6&pd_rd_r=308b5c45-c500-423c-8625-d92cf6c58804&pd_rd_w=CeuHO&pd_rd_wg=7HQCC&pf_rd_p=148e9898-1bed-4a70-9840-46f32e4185bd&pf_rd_r=DVRG5GT9P38WYHAANWHT&psc=1&qid=1644342605&sprefix=rc+motor+heatsink%2Caps%2C61&sr=1-2-f4ff053e-b1e8-4d31-8f95-56d755c862ba
G27 encoder wheel STL - https://www.thingiverse.com/thing:5238453
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