I have'nt looked at the schematic of BYOC's reverb, but with the philosophy they sure wanted to emulate the fender in a box type of sound or the other classic verb tones in a simple package. It's probably able to give you longer «dreamer» reverb sounds, but you would need to modify the mixing stage of wet and dry signal because that is where it all happens with these circuits.
For my part, i mostly use the Medium Brick aswell, built couple one with the Long... i think the main matter about these is the inherant modulation that you will hear in the reverb «dwelling»...
IIRC LaceSensor did a nice mod thread about the Tenebrion in the Mod section of this forum where i've also chimed in.... once you have the pcb layout in hand wich i'm heading at the post office today and make your mind on how you want to tackle it.... feel free to PM me or send me an email for more info or idea you have and want to know if they are possible... I've probably built over 10 variants from that core circuit.
Cheers!