How to control the spacing of each cell in a grid?
In the example below, Title and Subtitle rows waste too much space above and below.
Also the rectangle in cell {4,1} is rather small, how to change its size?
Also the SpanfromBoth does not seem to work well since a vertical line shows up between cells {6,1} and {6,2}, and also between {6,4} and {6,5}.
title = Text[Style["Title", 26, Black], {0, 0}, {0, 0}]; subtitle1 = Text[Style["Subtitle 1", 26, Black], {0, 0}, {0, 0}]; subtitle2 = Text[Style["Subtitle 2", 26, Black], {0, 0}, {0, 0}]; Grid[{ {Graphics[{title}], SpanFromLeft, SpanFromLeft, SpanFromLeft, SpanFromLeft, SpanFromLeft}, {Graphics[subtitle1], SpanFromLeft, SpanFromLeft, Graphics[subtitle2], SpanFromLeft, SpanFromLeft}, {Graphics[Rectangle[]], Graphics[Rectangle[]], Graphics[Rectangle[]], Graphics[Rectangle[]], Graphics[Rectangle[]], Graphics[Rectangle[]]}, {Graphics[Rectangle[{0, 0}, {6, 1}]], SpanFromLeft, SpanFromLeft, Graphics[Rectangle[{0, 0}, {6, 1}]], SpanFromLeft, SpanFromLeft}, {Graphics[Rectangle[]], SpanFromLeft, Graphics[Rectangle[]], Graphics[Rectangle[]], SpanFromLeft, Graphics[Rectangle[]]}, {SpanFromAbove, SpanFromBoth, Graphics[Rectangle[]], SpanFromAbove, SpanFromBoth, Graphics[Rectangle[]]}, {Graphics[Rectangle[]], SpanFromLeft, SpanFromLeft, SpanFromLeft, SpanFromLeft, SpanFromLeft}}, Frame -> All] 
