![Razz :P](./images/smilies/icon_razz.gif)
Spending a grand to build a JTM45 to play at home, by yourself, seems nuts to me (unless you have a rec room the size of a concert hall, and no neighbors).
A schematic and layout for a 7-ish watt version of a tweed Bassman (of which the JTM45 is essentially a copy), using 6BM8 power tubes and a $25 Weber power transformer, is available over on the Hoffman forum. Link: http://www.el34world.com/Forum/index.php?topic=562.0
Download the software to view the files at http://www.expresspcb.com
Thread with pictures of one: http://www.el34world.com/Forum/index.php?topic=5290.0
Clips: http://www.musicwebtown.com/jallenshaw/46763
It's not a kit, but you could source all the components pretty easily, and you'd end up with an amp that would be a lot more usable for your stated purposes.