I'm sure there is something similar to this out there, but I decided to make my own during my brief stint on the "other" server.https://docs.google.com/spreadsheets/d/18TDh_LjY8F_MZjSgQeSO6zRqijqLxsFWTKTK7RG8lO0/edit?usp=sharing
****ONLY THE RED BORDER CELLS CAN BE EDITED BY YOU (that was done, so no one dicks with the formulas)***
1.) <-- Is your the stats of your current item (that you will be replacing).
2.) <-- The reverse engineering bonus.
3.) <-- Is the composite, of the item(s) you will be combining, for your RE project
Hope it comes in handy.