I made my own big eye plate a few years back with 664's.
Nothing short of phenomenal and I have packed them alot of places.
My method was very easy for me to build, easy to adjust collimation and even easy to adjust in the field. Also made own case with loops to attach to outside of my pack with compression straps if needed for quick access when pack has little in it.
If I remember right the whole works in the padded case weighs just over 7#.
I also carry a single 20-60 eye piece in my pack in case I need a closer look at something but it gets used very little so I have been leaving it behind a lot lately.
I considered selling the plates for other to put together big eyes but didn't know if there was a market.
Sent from my Pixel 6 Pro using Tapatalk