It's  really good idea. There is a shortage of jobs in the N Saharan states and this ongoing development could be the start of something big. Especially if they build the cell fabrication factories to keep everything local.

If they were to put the entire array on stilts (eg melted sand poles) then you owold get much lower evaporation from soil and agriculture would benefit.

Have solar powered (direct or not) fresh water and you could pump that inland. Keep building that infrastructure and over time it could be significant.

And if they gave over say 10% of land to coppice trees whose produce were to be sunk in deep water, they cold begin to offset carbon (a bit).

All round fabulous idea.

keep to the Fen Causeway