I have used that same style mini greenhouse for several years, but just for hardening plants for a week or two before plant out.
As others have said, the biggest danger is over heating, and with it I've found, comes major condensation problems. Even on cooler days, I unzip at least one side of the door before the sun hits it. If I forget, things get steamy and over heated very quickly.
While more mature plants can recover from these conditions if regularly corrected with venting and cooler air, delicate new sprouts may not be able to survive.
Give it a try and see how it goes, and also go with your plan to have back-ups just in case. And if the ones started in the green house don't make it, you'll have it available for hardening off the indoor starts when they outgrow the window sills.
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