Hi! First-time saber build here, and I am so lost (there's a reason I flunked engineering in high school.) I've got a question about hilt space.

I'm looking to build a basic saber that isn't that long, but am worried about making it too short to comfortably fit the electronics inside. As more experienced builders, what would you recommend for length-space vs. guts requirements in terms of

- a basic saber with battery pack and LED, either AAAs or Li-ions, buckpuck included

- same basic saber but with sound added

- a basic saber no-sound but with the potential to upgrade later

I don't want to cramp the contents to the point I can't get them out, or worse, melt down the saber over heat issues because I stuck flammable something against warm space. But neither do I want a lot of extra space rattling things around and potentially causing dislodging/breakage due to clash impacts. (this is a saber intended for combat.)