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I can’t really judge the architecture present, though the terrain looks pretty nice.
When building something historical, it is always important to remember what people, in this case the Romans, had at that time. I doubt soldiers would have time to use stone bricks to build a camp. In addition, it honestly looks more similar to a fort.
Back then everything would’ve been hand made. Despite Roman soldiers being capable builders, I doubt they could do something like that, especially considering the strife the Roman Empire would’ve been suffering in their conquests.
P.S. I will go over stuff in more detail when I have the time.
[ EDIT ]
Roman Soldier Details
During war, the Roman Empire would, of course, need infantry to fight for the war effort. However, as you should know, Roman Soldiers would’ve had to march towards their destinations. These marches would usually be twenty-five kilometres, if the territory was inside the Roman Empire itself, or hundreds of kilometres if these were borderline battles.
Then imagine the weight each soldier has to carry. A Roman soldier’s armour and weapons, including their gladius, scutum and two pilla all weigh over twenty kilograms and that’s not even including their backpack carries everything they need, including food and all the tools ,spade, saw, pick-axe and basket, they need to build a temporary camp, as camps are usually temporary. Roman Camps were usually just some tents with a makeshift stable for the horses carrying heavier supplies.
Roman soldier’s also usually had to build the path they walked on, for future legions. Each legion has close to 5,000 men, divided into cohorts of about 500, further subdivided into centuries of around 80-100 men. Now imagine the size of the camp if Roman forces usually moved in groups from 3 to 10 legions of soldiers.
So we have a camp that is needed to be built to fit from 15,000 to 50,000 men who have marched across Europe wearing extremely heavy equipment and needing to literally build the road they’re travelling on (including bridges if they came across vast lakes).