Made this last year. Sun Tuff GH sheeting for the sides.
Achieved 6 to 8 ° warmer soil temps on sunny days.
got some ripe toms, (4th July were best , Early girl next, others not much fruit & none got ripe).
Soil is HM compost, garden compost, moldy leaves. grass,garden stuff (1/2 done garden compost) mixed together.
This year plan to try a 4th & an Early Girl & stake up to expose the side to the sun better.