The armor itself and the Neo Crusader armor is very similar. Both came after the Red Guards in ROTJ in the real world timeline. In Universe, the armor of the NC and the SG influenced the Red Guard armor.
That said, the Sun Gaurd armor is quite similar to NC armor. It's cool stuff but, it's a different character group in universe regardless of similarity. CRL wise it would be nearest to the NC CRL which is, other than canon character CRL's, is the most restrictive with no room for customization. So, it wouldnt meet NC CRL's.
If you and your dad like that design, make NC armor.