Yes, I was extremely relieved that no cutting, drilling, blu-tacking or taping was required. The only "stressful" part is getting the top half of the flight suit on the phicen body. It wasn't particularly hard, just a tight fit, so go slowly there.
One other thing to note - the neck peg on the phicen is ever so slightly larger than the HT neck peg(or it simply doesn't have any give like the plastic peg) - but the helmet does pop on with just a little extra push.
Thank you so much! I love it when everything ports over without and mods.