I will be planning everything down to the minute detail. Really, I'm trying to build a complete list of items required to be able to complete the build. Which will eventually include the hilt itself. But by completing a list of what I need for the electronics to work, I can start to build a picture of the space needed inside and whether a smaller hilt will be to difficult to house the chassis while keeping it looking good, or whether going with a longer hilt. If I know that the ID will be, 1.25" and its going to be the same diameter all the way through, that's why I thought of putting the chassis together so I can work out the length needed and where, if there is going to be a section to view the crystal chamber, where abouts on the hilt that will be to look best and keeping as close to my nephews design as possible. I totally realise I'm new to this and looks like I'm working backwards lol I just have a picture in my head of how I want to proceed with things. If that makes sense.