If I were in your position, with my knowledge, I would use ACCPAC. Out of all the accounting software I have used, nothing has been more simpler in job costing or putting pieces of "inventory" into a final project. It may be possible for me to set up a mobile app to review production inputed into Accpac, but this would depend on your connectivity, if servers etc. VirualPrivateNetwork.
Lets talk more.