Simultaneous Real Time Clock and stopwatch

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hi,

i looking augment clipboard, such 1 pictured below, rtc , stopwatch capable of being displayed simultaneously.



the clipboard has flap seen , clock/stopwatch placed in top right or left corner of actual clipboard (not flap). small , flat possible. hole cut in flap accommodate it, still cannot stick out much.

the stopwatch should started, stopped , reset button push or similar, , display minutes , seconds, preferably *not* smaller.

i have searched ready made solution, found none. such, turned researching making myself. have searched arduino applications of this, found none far. how simple me implement? majored in informatics , have worked few years tech guy @ small radio station i'm not entirely out of waters, more used connecting cables soldering , assembling. , coding consists of small amount of java , sql several years ago, imagine code such rudimentary functions should available.

how feasible project? ideas on how go it?

flattest: flexible film pcb additional components soldered on it.
lcd screens can small , flat; make sure connects on i2c , attiny should able this. simple buttons , you're done. think of tiny calculators , so.

feasibility: total.
but one-off it's going expensive. expensive.


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