i think you need reach out your local Ruckus sales engineer guy to help you answer your first four questions...
yes, you can combine ZF7343 and ZF7363 as to test roaming, STA roaming from one AP on 2.4ghz to another will re-associate on the same band..
cheapest Ruckus AP for Vscg is ZF7341. supported AP's are on as per
SmartZone TM Software 3.1.1 Patch 1
• ZF7441 (DAS AP)
• ZF7782 -E
• ZF7782 -N
• ZF7782 -S
• SC 8800-S (v1)
• SC 8800-S-AC (v2)