Oh I see,

so one of my side panels (as a rectangle) would be 0.28m x 0.085m = 0.0238m^2

then it's 0.0238m^2 x 0.005m = 0.0000028322m^3

Then 0.0000028322^3 x 7850? or is it 7850^3?

= 1.7833698e-13 (1.783kg)?