how much space between plants in veg

Hi just after a rough idea of how wide and high i would have to make a box for a vegging chamber for 3 plants. I am going to build the box tomo but have no idea what the size will need to be. I dont have tons of room to work with as the flower chamber takes up alot.

I am planing on running a diy plastic dwc box to house the 3 plants before i move them to the rdwc in the flower tent.

any help i would really appreciate

Not trying to be funny or sarcastic, but that is way to vague of a question to get a legitimate answer.
The size of veg room depends on
Number of plants
Strain of plants
How long you're going to veg
How much available space you have for veg box

Hard to say like hyrdrogreen says, but if you want an estimate I would say at lease 4'. You would want as much light to get to them as possible, so if their crammed together your going to lose light efficiency.

W3'xL6'xH6' will give you enough room for most strains. Plants can sense objects around them and will alter there grow pattern. Better to have more space than not enough. Also if you have a tiny box it will be more difficult to get stable temps. Temps are key to have a better than average grow.

okay i will make the box as large as i can, it was more the height that i was worried about, will give it a go and see how it turns out thanks