Yep, that sounds like what we've done before. I'm no doctor/nurse, but if he becomes limp/listless/unresponsive at any stage I'd seek medical attention (trust your gut - if you think an ambulance is warranted, call for one. The operator will assess with you how urgently it's required).

You can also alternate panadol with nurofen (they can be taken at the same time, but follow the dosages exactly), and nurofen will often last longer (closer to 8 hours as oposed to 4 for panadol).

I've been given conflicting advice about the baths too - the last time we called an ambo for my DD when she had a febrile convulsion (temp spiked too quickly), the paramedic recommended using lukewarm towels under the armpits. Other doctors/nurses have said go the baths.

Hope your little man is feeling better soon!