Yep, that's my diagram... I haven't built my system yet, but I put that graphic together based on other builds on here. I'd put the switch before the SSR's... right after your power cord comes into the box. I'd also go up to the 40A SSR's. It seems overkill, but the 40A SSR's will run much cooler than the 25's and it also allows you a little more wiggle room in case you decide to move up to a 4500 or even 5500W element later on.