thanks guys,
we went with 1.5" tube all the way through. im not a fan of 1.75 on such a small car just for the fact that as its all tied in together just looks to big. Form and function are number one but it has to look good...lol. i am also not a fan of building a cage with smaller diameter tube as support pieces unless its dubs as a grab handle. or holds up body panels. but to each their own i guess.