plans for my d.i.y grow cab

hi all im new to all this but i wanna make a grow cab this is my plan the cab is going to be 7ft/4ft/2ft and split in to 3 parts the fist is the red part the flowing room 2ft x 2ft x 7ft

next is the gray cab 2ft x 2ft x 2ft this is the carbon filter room and electrics i will have 2 plastic tubes from this cab one in to the veg room and one in to the flower room to pull air to the carbon filter from both rooms im also thinking maybe make the plastic tubes in to carbon filters as well to help keep the smell away ill also have some O.N.A gel outside the grow cab as well

next is the veg room 2ft x 2ft x 5ft we have an air intake in both grow cabs going to use a 4" EXTRACTOR FAN Speed: 2500 rpm in each the kind you have in the bathroom also going to install 2 100mm in line extractor fan vent back draught shutter,s

going to also make 2 3 gallon rubbermaid,s one for each cab one plant in each 1 flowering one in veg

what do you think peeps

all that just to veg one plant and to flower one? doesn't make sense.