Rounding is again dependent on industry, I work for a shopfitting company Autocad works to 7 decimal places We do our drawings to the nearest half millimeter and then the joiners use a measuring tape that quite often varies by up to 3 or 4 millimeters per meter than another joiner. But engineering work to much tighter tolerances. I think it gives a much clearer impression with the measurements in your latest drawing but it goes outside normal standards, I would either include 2 drawings 1 without the fillets as you show and a second with the fillets detailed, or with a single drawing but extend your lines with a dotted line beyond the fillets to the corners. However you decide to show the information most often comes down to your industry and it is not worth trying to change how information is usually standardized as all your co-workers expect information in a certain way.
Regards Steven Gray Setting Out (Joinery Manufacturing) Autocad 2013LT Windows 7 professional