ive made a few terrier boxes in the past but use 12mm ply tricky to make but enjoyable bet these are a lot of work good quality though.
on the front would be no good for me cant see where your going especially with the terrarin where i live flat fields would be ideal but no such luck for me
could you make one with 3 compartments each measure 300mm width x 300mm height and 400mm deep and to fit on the back of the quad i would be willing to pay for one like that ,
what are the chances Aron