Sorry all my questions are about heroica, but this needs to be easy so that I can build in a few mins. I will make gladiator micro figures as well, if someone can make a Lion too!
your going to need alot of pieces. and i dont know if you are talking about making it for your game boards or for your mini minifigures. me, the lego know it all, will help you out. i have made a ton of things, including a lego to-scale tennis court. that was fairly easy and i made it in about 3-4 hours. so, if you want to make and arena, you first have to make a square, or cirlce sized box like base, with walls. so make 4 walls and put them all together as if you were making a house. then, make some stands. these will be supported by poles or stacked bricks ot have the height over the wall. this will take alot of pieces, but very basic pieces. what you want to do is using long skiny 2by12 0r 2by10, or any longer plank, and 2by4 thick bricks, and you will want to build some seats or bleachers with those. i will upload a pic of those soon. then, you want to kinda of make a roof over those bleachers, and of course you also wnat some entrances and mabye a gate or tunnel. then you can use the bear from lego forest police, make some chariots, and have fun.
Let's assume that the Heroica figures are exactly half the scale of the normal LEGO minifigure. That would be roughly 1:100. At that scale, 1 meter would be roughly 0.75 studs long or the height of a standard LEGO brick.
Now let's convert the Coliseum dimensions:
To calculate the real dimensions of this LEGO construction, let's remember that a brick is 9.6mm high and the distance for 1 stud is 6.4mm (= 1 stud radius + the distance between two studs).
Using these values we get:
@Those two distances are calculated by multiplying 6.4mm with the number of studs, and then adding 1.6mm for the last little bit of beam left after the last stud.