The MRF150 transistor design for an HF amplifier is not new, in fact it is over 2 decades old.
Have you examined the latest NXP and Freescale LDMOS, 1 kW devices?
Jim Klitzing, W6PQL (retired HP engineer) worked on his design for over a year,
based on his earlier work with VHF/UHF designs developed (and sells as kits or assembled).
1 KW SSPA for 1.8 to 54 MHzhttp://www.w6pql.com/1_kw_sspa_for_1_8-54_mhz.htm
The cabinet consists of the front and rear panels and a floor plate Jim made by Front Panel Express (www.frontpanelexpress.com
); they have design software you can download for free, which allows you to design custom panels and order them through their system. Their CNC machining process does all the hole cutting and engraving of those parts, and the panels can be ordered in a powder-coat or anodized finish.
The wrap-around cover and internal support brackets and tie-ins he made here; the standard color he used is light gray with a medium gray cover, but if you want to match existing equipment, many other color schemes are available (black anodized finish with white lettering for example). You can expect to pay about $275 for the panels if ordered directly from Front Panel Express, and the rest of the parts to make the cabinet will cost around $150. If you have your own sheet metal tools (shear and bending brake), you can save some $ there.
If you do want to go the Front Panel Express way, a block diagram of the amplifier, and my design files for the panels metioned above can be found in this folder.http://www.w6pql.com/misc/hfsspa/