Vegetative in grow box and flowering outdoors? Tips and tricks is welcome!

You can do that and I'm sure other do it as well to some extent. The only problem is that outdoors needs to have a uninterrupted dark cycle to say in flower and keep it there. Does not matter if you initiated the flower cycle indoors, if the light outdoors is greater then 12-13 hrs it can go back into veg or it can get stressed out and hermi. Ideally 12hrs uninterrupted dark period but can happen on 10 or 11hrs with some plants. If the light outdoors is already in a 12/12 like cycle, I don't see you gaining anything from bringing an indoor plant outdoors other then some hydro costs, the exposure to pests is more problematic to me. Plus if your light source indoors is not that strong and there was no fan present your tent the pant can be hurt by winds "branch snapping" and sun "burning leaves from stronger light" as its not used to the elements. will have to harden it off. means to explore the plant or plants to small periods of time outdoors working your want up to fully outdoors. works best in morning till just before noon when the light is the strongest. This will all depend where you are in the world as well. closer to equator the light cycle does not change much and is pretty close to 12/12 all year round. the more you move from it the greater it varies. Eg. in my location days are aorund 17hrs light and 7hrs dark in the summer. Then in winter it's opposite 7hr light and 17hr dark. Given that I live in a city the light pollution also affects my grow if growing photoperiod plants. Autoflower less so with light pollution just pests like aphids and mites. Good Luck!