Citroen dispatch xl wheel base. 2019. 8x4 sheet material upright. Will it fit?

[Gingerpot]

Hi I'm looking to get a dispatch 2019 xl wheel base as a work van (carpenter). I can see from all the specifics that an 8x4 sheet will sit on the deck horizontally, but I would like to find out whether it will fit standing vertically so I can kit out the sides in racking and I'll still be able to fit sheets of 8x4 in, in-between the racking. Would anyone be able to help? Many thanks

Andrew