The CabiBUS design is based on this estimated minimum cabin interior size:
Height 170 cm, 66,9 in
Length 100 cm, 39,4 in
Width 95 cm, 37,4 in
Now, when the first cabin prototype is built, it feels very roomy, it should be no problem for anyone to spend an hour commuting from home to work.
As can be seen in the images, the height can probably be reduced a bit, making the CabiBUS lower and so increasing the range. Still plenty of room for the tall person, here 196 cm, 77 in.
There will be a very comfortable seat, the one in the pictures is just a standard chair.