First look at the two most popular EVFs on the market side by side. Surprisingly not a 'major' size difference, nor a huge weight difference. The Z-EVF is super lightweight, but when used with the Zacuto Z-Finder it adds on a bit. Note: I have no affiliation nor have I ever received any items from SmallHD or Zacuto. Now that the SmallHD DP4 was available, I purchased both the DP4-EVF and Z-EVF Flip to see which of these would best fit into my workflow. Whichever I choose would be my personal opinion on what works best for my situation. These are just my initial thoughts while I piece these two together for a more thorough review. More to come soon enough..
Now that the SmallHD DP4 and Zacuto EVF have made electronic viewfinders for DSLRs (somewhat) affordable, you'll see some popularity around straight inline shoulder rigs. Popular DSLR rigs used an offset to place the entire camera in front of the operator. Although DSLRs are light weight, once you add a few items like recorders, lights, microphones, and follow focuses, you're managing a few pounds over the hands. Pretty tiring and less stable.
Like conventional video cameras, the straight inline rigs align all of the heavy weight over the shoulder (better on your back) and less outwards over the hands. Only the EVF needs to be positioned in front of the operators eye. Straight inline DSLR shoulder rigs + an EVF can help you towards building a more balanced, stable rig, not to mention overall lighter on the hands. If you're not looking into an expensive EVF, you can still offset an inexpensive small LCD monitor (as seen above).
Instead of dropping a few grand with a Redrock config, there's a few similar rigs you might want to look into over at Express35. These straight inline shoulder rigs are bundled with a comfortable contoured shoulder pad and counterweight. These are well designed for EVF or small LCD monitor use. (seen above). You can find those rigs at the site (click here). If all you're looking for is a DSLR baseplate, Tripod Mount, and a basic rail set for your Follow Focus, there's also a weekend sale on the basic rail set going on right now too found here.