Order now
The tail cone is pretty quick as far as the aluminum work. I would put in the order for the fuselage now. I always tried to have at least two or three components in process at any given time. When one got stuck, I would move on to something else while I got it unstuck. If you are unsure of time to build, go to kitlog.com and search RV10s (or look in their signature line for links). There are lots of people who have posted their entire build with time separated by component. Easy to compare the 1700 hr builders to the 5000 hr builders.
There is plenty to do while you wait. All of the fiberglass needs to be done. I have a friend them left them all till last and is now having a hard time getting finished. On the other hand, I did them as I want along while waiting for money, parts to show up, engine etc.. or just plane forced myself to work on them as I went along. In the end, everyone was amazed at how quickly everything came together once I moved to the airport.
You can also start working out your electronics, researching brands, planning you primary wiring scheme. Lots and lots of decisions will need to be made. I have probably more un-logged time thinking, researching and planning my build than logged shop time. Don't accept all of the opinions on what needs to be upgraded or changed from the kit unless you have lots of money. Weigh the options and list them out on a spread sheet, read other's blogs on what options they chose and why. Sort out what you want as far as functions, then start matching components, comparing vendors. For example, I found there was very little price difference in the avionics vendors for the functions I wanted. Others have found big differences.
Try to get an idea of the components you want and start gathering info, drawings, power requirements, installation manuals. All of this is online. Make a binder, you will refer to this often during the build. An example from my build, I went with CPI2 electronic ignition late in my build, which required multiple switches, electronic boxes and a back up battery be installed. I had to find ways of fitting extra components late in the game. Sit in a comfortable chair, close your eyes and imagine in detail flying from start up to shut down. Where do you want your switches, what switches do you want. Walk through it in your mind until it becomes familiar. Get the plans CD from VANs and look ahead.
The fun is just beginning!