I know you mentioned the $0 cost for some items not being accurate but doing it that way will come back to bite you if\when you decide to actually build more to sell -- If this is truly a test build to see if it can be done profitably I'd suggest pricing everything (this includes all the screws\wiring\tool bits that wear out\ etc.) and ordering new parts for everything used in the build to also get an accurate estimate. Gathering all of the needed supplies can add several hours to the build time (esp. if trying to source lower cost product rather than just using on hand inventory) Plus using on hand inventory fails to include shipping cost on those items which for things like monitors\buttons\wood panels\encoders\etc. can add substantial costs (sometimes even more than the parts themselves) -- and failing to figure in wear and tear and maintenance costs in on the tools can also turn a small profit into a loss once a tool(s) need to be replaced if that cost isn't included. (router bits\saw blades\etc. aren't free to replace or sharpen and need to be accounted for in the costs as well)



At a minimum if using on hand inventory at least include a replacement cost for those items including shipping so that you get a better idea of what the actual build cost would be and add in a % or flat cost for tool depriciation\replacement. It is often very easy to underestimate the little costs like consumables (ie. screws\drill bits\wiring\solder\glue\paint\sandpaper\etc.) and turn what you think is a small profit into an actual loss on the projects when you fail to properly price the item because you forgot some off the build costs !

