Epp Help Me
Might I suggest that a little modification of attitude could help in the mending process as well. Especially if you want your parents to assist with replacing the "mashed bits". Like I would not trust the Rx crystal - replace that for starters. Like what is the battery pack like? Tested it? Do it. Work right through the whole electronics and get it checked thoroughly...before you mash someone or their kid.
I will tell you for free that if one of my kids (they are now 30 and 27) came home with a wrecked racing bike and thought it a joke there would be little in the way of sympathetic hearing from me. The value would be about the same...US$250?