A Terminator in Inquisitor.... HE WOULD BE INVINCIBLE. Space Marines are tough enough let alone terminators. You will definately have to tone that down, i have never meet anyone that even thinks about having a terminator in inquisitor, that would be hugely powerful for the player with him but dead boring for the player against him. If you did go ahead there would need to be a serious back story as to why he is in the campaign.