https://docs.google.com/spreadsheets/d/1UA3iqOL9QuqsjC0WmDul5MFztaNtYX31g4kojX09Ig4/edit#gid=0
I have been a little busy with work etc.
but keeping the basics simple I have tweaked the xls spreadsheet.
Feel free to make a copy and use.
I will update when I can. Any extra suggestions or features let me know in my public discord channel.