more performance faster?

[sgf]

        public  UInt16 len 
        {
            readonly get => (UInt16)BitPrimitives.ReadUInt16LSB(other, 5, 11);
             set => BitPrimitives.WriteUInt16LSB(ref other, 5, (UInt16)value, 11);
        }

if like this will better:

    public ushort len {
        [inline(256)] readonly get => (ushort)((other >> 3) & 0x07FF);
        [inline(256)] set => other = (ushort)((other & ~(0x07FF << 3)) | ((value & 0x07FF) << 3));
    }

If done to its fullest potential, it might be possible to generate two structures: one for building and one for reading only, thus fully benefiting from compiler optimizations.

[sgf]

by the way,Do not attempt to throw exceptions in the generated properties.