Dynamic block for dimensioning

I want to create a block which will be able to automatically display dimensions as pulled from gridlines in two directions. The dimensions would be displayed over lines perpendicular to each other which would have arrows indicating the direction the dimension was pulled from. I am hoping to create a faster way to generate plans for field installation use. Currently we paste a block and manually type in the dimensions and rotate the arrows.

I would greatly appreciate any help with this.

I have not figured out how to attach a graphic of the block and could use a tip for that also.

Thanks

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