The REAL cost of building
When I run some numbers on my -8 I'm planning ... it seems to be about 20-30K cheaper then what is on the market (say; Barnstormers).
If you haven't built an aircraft before, your projected budget will ALWAYS be a gross underestimate. That's because new builders have absolutely no idea of all the things that they will need beyond the kits and the obvious components. I'd say most first time builders eventually spend at least 20-30K more than they ever imagined (and sometimes a lot more than that).
Many projects get turned over simply because costs balloon beyond all expectation.
Don't forget to include the cost of fabrication tools in your budget as well. Remember....if you buy a flying plane you don't need to purchase all those tools.
Some builders say they don't include the cost of fabrication tools in their "cost of building" because "it isn't part of the plane". But of course that's a nonsense. WHATEVER you need to spend to complete the plane is the REAL cost of building.....that includes tools, construction insurance, any rented workspace, transport of airframe to an airport, painting etc etc etc. I mean, TELL YOUR WIFE THAT THE TIMBER YOU'RE BUYING FOR THE WING JIG ISN'T PART OF THE COST OF YOUR PET PROJECT.
Many builders have no accurate idea of what their plane actually cost to build because they build over quite a few years and pay for things as they go with no real records kept.
I, on the other hand, have kept a kitlog expense record down to the last dollar.....and it is truly frightening. In many ways I'm sorry I kept an accurate record.....it's a bit depressing. It is truly amazing how much money you can spend over the years on simple consumables like degreasing solvents, sandpaper, protective gloves etc etc.
My advice now to prospective RV owners is to build ONLY IF YOU ENJOY BUILDING. Otherwise it's probably cheaper to buy a flying plane (or a very advanced project) when you look at the REAL outlays.