Actually, cheaper walkie-talkies work in pmr446 uhf unlicensed band, which falls within the cc1000/c1101 range. So, it is feasible. However, it will be only a toy because of its 100mw power limitation, which is consistent with a small button battery cell as the main power unit, although it would be depleted quickly. Nonetheless, if the 10y old boy understands what he's saying, he deserves an engineering scholarship. I didn't work on this kind of pcb designs until 3rd grade in engineering school.