I was advised of this from a couple of builders "after" my first one. On the 2nd 7, I followed this and life was a lot better.
There seems to be two milestones that creep into the build process. 1) Getting the plane on the gear. And, 2) mounting the engine.
Both usually occur WAAAAAAY to early in the process. As soon as you put the plane on the gear, you limit the easy access to the interior. My recommendation is to keep it on low saw horses till your panel and all interior work is done.
I even recommend mounting the engine with the plane on saw horses. You'll need to weight the tail but that is easy. This will allow easy access to all the FWF stuff, cowl mounting, etc..... I mounted the engine temporarily, marked all the items to be mounted on the firewall then removed the engine. This made all firewall work really easy. When done, the engine was remounted.
When it comes time to "put it on the gear," it is a simple process with an engine hoist. Definitely try to avoid these two milestones that will make your build tougher. Both are easily accomplished after you get much more work done.