Hello,
This link should allow you download the Excel sheet I've created to help my Tinkerer player (and me) easily crunch the numbers when creating a construct. There shouldn't be any locked cells, so feel free to make improvements and share yours too!
(looks like I can also just attach the file on the forums too)
http://www.filedropper.com/constructcreation2nded
Construct Creation 2nd Ed.xlsx