My first question would be, how big is the room you wanna expand from the tent into?
Not having that answer yet, and just assuming it’s a standard American bedroom size, around 10f x 10f x 7+f height, You might think about the following layout:
2, 3x3-4x4 footprints, with 6-8 plants per footprint, or whatever number your laws allow for flower.
Hang the led fixtures vertically, tall, with the 300s back to back, and the 50s in between, perpendicularly. Because of the difference in wattage and thickness of led panels, it will be a disproportionate recatangle, so place the majority of foliage toward the 300s. You would probably have more of an oval than a circle canopy from above, but should still get a good g/lw yield in a 4x4 footprint or less. You should be able to fit 6-8 plants in that footprint, that are about 1.5-2fw x 4-6f tall, and probably at least a foot deep. If you can coax 2oz out of each, That’s 12-16 per light cycle....but at those dimensions, you should be able to pull more.
....Or you could just configure those panels into a 2 dimensional wall of light, and blast them at about a 4x4-6x6 wall of plants, but you’d be losing 3 potential 4x4-4x6 canopies.
For the second 4x4 area in that room, I would stack the HID bulbs, and put another 6-8 plants around them. Normally in stacked situations, the higher wattage goes on top, but with the reported performance of CMHs, you may want to put the 315CMH on top, and 400HPS on bottom, so that your tops get the extra goodies the CMHs are supposed to bring. This is just from research and speculation though, as I haven’t used CMH personally...just 400HPS and LEDs.
That should leave you a bit of room to move around, and give you way more canopy space than your tent. Just deal with the airflow for the whole room accordingly.
Hope this helps some!