Hi - the conversion was done by Exploria in Brighouse - their w/site has lots of info, but perhaps these pics will help a little too.
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We generally have the table along the length of the van when preparing / eating. I think we were showing it to friends when this was taken, trying to show that 4 people could sit at the table to eat. We like this table set up a lot btw. How you are supposed to prep food and move around with a table mounted on the unit, with a leg mounted on the floor, baffles us.
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As you see, the seat can come a little further forward for travelling. At the most rearward position, I don't like travelling on it at all. And we have windows on the rearmost passenger side too. I imagine children would find it difficult.
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This would be the usual position when used as a seat when we're set up for camping. Makes access to the cupboard space easy. Pots / plates etc all live in the sliding door unit to the right of the fridge. The gas is beside that unit, below the cupboard in the tall unit. We generally use it for food etc. The electrics are all in the cupboard with the tall sliding door, and we generally use that space for bulky items like sleeping bags in their kayaking dry bags.
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This is the "shelf" behind the seat / bed (the "sleeper pack"). It's perhaps a couple of feet long - as you see, lots of useful storage underneath! It's shown here with the seat / bed in the bed configuration. In terms of storage, I agree. It was a huge issue for us, having as much storage as possible as we generally have a massive amount of kayaking kit and we try not to have anything on the floor of the van when travelling.
The leisure batteries are under the side units, accessed through the foremost of two lower access panels below the bed. The gas is in a gas safe, below the tall unit, beside the sliding door. We opted for an underslung water tank as well. So all the cabin cupboard / storage space is free for food etc. The rearmost storage spaces are used for kayaking kit in transit. This said, as you see, they are also accessible without having to open the tailgate.
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Rearmost cupboards - and the cunningly folded mattress on the "shelf". This with the seat in seat configuration. The table-top stows cunningly in a recess at the back of the seat. The "shelf" and seat can be taken out if necessary, I'm told! The seat will weigh a lot though, so I've never tried it.