You can have more than 1 participating hop

Let's say we have Alice and Bob, alice wants to have 4 hops both outbound and inbound and Bob wants to have a 2 hop inbound and a 1 hop outbound

Alice's tunnels would be:

Alice -> Participant A1 -> Participant A2 -> Participant A3 -> Outbound Endpoint 1 -> ?

Alice <- Participant A4 <- Participant A5 <- Participant A6 <- Inbound Gateway 1 <- ?

Bob's tunnels would be:

Bob -> Outbound Gateway 2 -> ?

Bob <- Participant B1 <- Inbound Gateway 2 <- ?

For Alice to send to Bob and receive a reply the round trip path of the message would take would be

Alice -> PA1 -> PA2 -> PA3 -> OBEP1 -> IBGW2 -> PB1 -> Bob -> OBEP2 -> IBGW1 -> PA6 -> PA5 -> PA4 -> Alice