IMO, five x five feet is HUGE, do a trial sizing with folded cloth (small flat bed sheet or similar) to figure out sizing, make the dark cloth as small as reasonable to work and the dark cloth does not need to be rectangular in shape. Half roundish or remove the dark cloth material where it is not needed (usually on the sides).
Keep in mind, larger the dark cloth more bulky it will be, more difficult to deal with and the bulk makes transport less easy.
IMO, smaller is far better in many ways.
Bernice
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