A tight setup for sure. That SC-5330 is a beast (I have the 5300, silver face version of same) although I seldom find a reason to listen to cassettes anymore as I migrated my music library away from tape years ago.
That kit should provide you with a lot of enjoyment for some time to come.
Those accessory trays (Sansui branded rack mount drawers) are one of the rarest of accessories to find now. Probably easier to find an MA-7 than one of those drawers...
I don't imagine many were ever sold, hence the noticeable lack of availability 40 years on.