Truck stance and crossmember questions

[Envy]

Im new to the forum and have a 65 swb fleetside that i have been working on since 2001. It started as a full restoration project with me and my dad when i was 15, but when i graduated, i spent a majority of graduation money on parts and then never touched it again. It sits in the same garage in rolling chassis form and piles of brand new parts to be added. I will try and start a build thread to explain all the plans...............

But the questions i have now are
-I am bagging the truck with the bolt on c-notch and CPP's tubular rear control arms, and the front 2.5 lowering spindles. I was wondering how necessary the CPP center crossmember is which allows a larger driveshaft clearance and higher ground clearance?
-I am also planning on using the stock a-arms for the front with the bag mounting plates and cups, how efficient is this compared to tubulars?
-I was also curious as to how my truck will actually sit with this set up and if anyone has used a similar set and can provide pictures of there truck and parts. Thanks