And somewhat of a BOM:

So now here's what you'd need to build the thing:

- Firebricks: K23 @ your local ceramics store. About 20 to be safe.

- Home Depot high temp mortar: 2 tubes, @ $4 or so per (it is in the
caulks section, blackish tube, rated to something like 2000F)

- Omega temperature controller or alike: Ebay,
for $40 or thereabouts you should be able to score one any day of the
week

here's an example:

http://cgi.ebay.com/Universal-Digital-PID-Temperat...

Omega is most widely recognized name in temp controllers, even though
they mostly OEM other makes


- High temp K-type thermocouple: $4 is about going price on ebay

http://cgi.ebay.com/Type-K-High-Temperature-Thermo...


- an SSR, a Solid State Relay:


$10, or less if you're willing to play ebay game:

http://cgi.ebay.com/CRYDOM-SSR-Solid-State-Relay-2...


- some heating wire, Kanthal A1 strongly preferred


Here's how it all works, simplified:

1 the wire heats up the interior

2 when SSR relay lets current flow through the wire

3 when controller tells it to let the current flow

4 when controller senses, from the thermocouple temperature probe, that
temperature needs to go up

5 to reach whatever temperature you set up on the said controller