Although not as common; we do get inquiries on our larger hatches to have a smaller access hatch.  Here is a recent example where we did 2 of these for a client.  The anodized hatch measures 48″ x 48″, and the smaller hatch in the centre is one of our 12×12 Quick Release (ANC QR 1212) models.  We also installed some more solid lift handles as opposed to the lift rings on our regular models.