[shifty]

matthuffman is correct - if you want to add more foam to your seat or create your own seat foam, here's my tips:

Get your foam from the fabric store. They sell it in different heights and thicknesses - you can use this to pile them on and contour the seat to your shape.

To shave the foam off for shaping, use an electric turkey carver, it's a quick and easy way to shape.

To stick pieces of glue together to make the rough cubic shapes you want (before shaving) use spray-on upholstery glue, you can get it from almost any store.

Long story short, get the foam in the shapes and sizes you need. Glue them together to make your rough shape, then use the electric turkey carver knife to perfect it.

Hope this helps.