Is 73 CM to short in length for a marginated hatchling as a cage??
I have added a pic of the plastic container I might get if its big enough.Its 73 cm length 33 cm width and 16 height
Personally, I find it too small. But the biggest issue is the height of that particular model. You'll need to provide at least 10cm of substate, which leaves you with 6cm of depth. Imho, that's not safe. You want at least 30cm.
PS: Length and width wise, the pink container should be suitable for the first 3-4 months, as they don't move a whole lot. Eventually, you'd like to provide your margy with an indoor enclosure of at least 150cm x 250cm x 60-70cm (substrate depth will need to increase, as they get to full size).