This pdf plan set has all the info you need to build the oval and ellipse cutting router jig. it includes detailed measured drawings, and a materials list. Most of the jig is built from scrap wood you most likely have in your shop.

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You can watch the box be built on youtube

How to build an oval cutting jig for your router
Downloadable PDF version
Materials List
Cut List
Detailed measured drawings

Affiliate links to some of the specialty products I used in this build

1/4″x20 blot

Star knob

1/4″ washer 

CA Glue

CA Glue Activator