Minimalist BGP Anycast Lab Built from VMs?

Hi List What is the simplest BGP anycast lab I can set up using Linux VMs running on virtualbox? I'm trying to build the minimum virtual lab to test an Anycast configuration based on BGP. I have enough computing power to run about 4 linux VMs on Virtualbox on a single laptop. I'm using BIRD as a route server (not Quagga, not Zebra) on Linux. Is this even viable? I'd appreciate it if anyone could share their experiences/configurations, diagrams if they've set up a similar lab. Thanks in advance, Traiano