We are implementing a complicated Manufacturing ERP and I was wondering if I needed to create complicated Routes and rules or replenishment would do!

I wonder if someone can draw an idea how to manage this scenario:
Client produces bricks where they have:

- A mixture (several different formula) which is moulded to shapes, which is put on racks (3 different sizes) and then dried in Ovens (3 different sizes).

Here is the interesting part.

-- The mixture is done in batches an used for more than one order.

-- Once moulded, the Semifinshed products are put on racks (3 different rack sizes).

-- The ovens (3 different ovens) can take 5, 7, 8 racks (means many combos)

-- The drying time per order is different.

The client would like to know what Rack is vacant and which Oven has vacancy. They also want complete visibility on drying time per order so that they know when to remove orders and what to put next. (They want to basically open and close the ovens the Minimal possible time)

Any ideas or suggestions would be greatly appreciated.