Absolutely. The 2.1, like the Pixhawk 1, is almost straight plug-n-play. But if the Solo bodies are appearing for pennies on the dollar with functional FCs, that's a DIY drone waiting to happen! Our beloved Solo has a rich flight controller. There's just not much in technical specs out there that would help with substituting ESCs and receiver. At least not that I've been able to find.Well the PH 2 is not the best candidate for a DIY move
the PH2.1 would be better for that.