Any lessons learned? I've been debating between building my own, buying a pre fab, or just getting a system (zymatic, robobrew, etc.).
BUILD YOUR OWN! Not only will you have something that you can take a lot of pride in, you'll know your system intimately, in was you never would something you bought. It's also much cheaper. And a lot of fun.
Though I'm making it up on the fly after looking at the Electric Brewery for a while I'll be happy to answer any questions you have and do anything I can to assist.
This is good advice if you have the skills and time - you really can save a good amount of money. I started down the DIY route about a year ago to convert my propane system with keggles and a cooler mash tun to an indoor, all-electric HERMS. I was using the Spike System (which includes a control panel from Electric Brewing) as a sort of template for the project. Once I priced out everything - including switching all fittings and valves to from brass to stainless, adding another pump, and the necessary electrical, plumbing and ventilation work - I ended up buying the Spike System ("buy once, cry once").
I have the skills to have done it all, but I'm at a point in my life where my wife and I have some discretionary income and my time is at a premium. I spent the time I would have spent on the control panel wiring on other work for getting the new brewery ready. With all of the work I did in decision-making, I think I understand the control panel about as well as if I'd assembled it myself.
This may not be the path for you, but I'm really happy with my decision.