I don't think anyone wants to be discouraging but we have experience with that set-up
and it is difficult. Been there.
Many have lost plants in just a few hours with fluctuations in temps. Cold nights and hot
days early-mid Spring.
In deciphering your questions i think you have thought this through and may have great success if regulating temps and have the time to check on things. It will vary just about every
day in your early Spring climate.
Maybe consider using a fan just during the day starting around 10am on sunny cool days for
6 hours on low to create air flow. Let it warm up, fan off, at sunset.
Overcast cool days, heat and fan? Hot days open the flap for fresh air.
Still quite a bit of temp fluctuation for any veg, especially tomatoes.
They are often best used in a cool basement or garage to keep temps consistent with a
light set up or in a back unused room. Keeps things contained a bit.
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