Nando I as well am an engineer so I can relate to what you have written and appreciate it. Unfortunately I am no longer able to continue in my profession due to disabilities which prevent me from the industry. Thankfully there are other ways to continue such as this activity to challenge the brain. I don't want to take away from your thread here so please if you want, check out the Saturn Apollo LUT one I have started for my project. I will continue to follow here with interest.