As a longtime 70D owner who modded (Jim Williams), at this stage I would 100% NOT spend the money to mod this deck and instead sell it for something much better. Zoom F3 if you only need two channels; Tascam X6 if you need 4, Zoom F6 or F8 if more than that. Or Sound Devices MixPre-II series.
Reasoning: Yes you may get an overall improvement in sound quality (I did) but all the 70D mods do not improve the 70D noisy preamps at high gain, and all the other decks I mentioned get you overall far superior preamps in addition to autoranging multi-DAC 32-bit float recording so you will never need limiters. They are also easier to use, have more features, better build quality, and are an overall much better value. If any of these decks were available at the time I did the mod, I would not have modded my unit.