How big the challenge is depends on the amount of stuff you want to put in it
If you want to keep it to the bare minimum the challenge is not that challenging.
But if you want more comfort you got yourself a big challenge
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For instance I want a fullsize two person bed in my TGB1314, but because of my length the bed has to be positioned lengthwise. I'm ~1.85m tall and the ambulance box is only 1.75m wide on the inside. Combine that with seating for 2, a fridge, a batterybank supplying at least 3 days of power without needing to charge, water storage, cooking equipment and more stuff.
And even my bigger (compared to a Pinz) TGB1314 is going to be a challenge.