I've encountered 2 bugs so far and I also have fixes for them:
1. Gammu's Fire Orb doesn't display it's ammo bar, the ammo number is still there though (Image 1). Looking at the SBARINFO lump reveals a one character typo on Line 662 where it points to "GAMMUFR1" (Image 2). I looked in Graphics > GammuHUD and found an image called GAMMUFI1.png and it looks like the missing ammo bar based on the screenshot on the itch page. Changing `R` to and `I` fixed the HUD.
2. Quote's SSG and Shotgun are swapped. According to the manual, the Fireball is his shotgun and the Witch's Staff is the Super Shotgun. In-game, the opposite is true. The issue is in QuoteScripts.acs in the switch case where QuoteFireball sets HasSuperShotgun while the Staff sets HasShotgun (Image 3). Sidenote: Why does the Staff set HasShotgun twice? Is that to get around some sort of quirk or is that a benign bug?
I've been having a blast with BYOC as a whole and I look forward to more potential content.