Using modern Caddock Non Inductive resistors a 100 watt 
(real, continuous, not PEP or lab conditions watts) was built in one evening.
Using two 100ohm 100watt resistors in parallel, along 
with a heatsink from an over though CPU and the aluminum 
box as part of the sink, it runs cool-faint-warm using 
the output of 8PV4 Bermuda Bomber for 5 minutes.
This load has a switch to allow selecting load or antenna.
(With this, I confirmed that my SWR meter reads right)

Prior Construction with holes installed.
Sink will be fastened to outside of box with heat sink grease between.
Resistors, held against inside of box (by 1/2" thick 
2" X 3" plastic; not shown) are also greased on their ceramic square section.
Wires are solid #12, bent and "twisted" to fit without 
tension upon components, then soldered.
A 5/16" copper strip grounds the resistor's leg #2.
6-32 hardware used throughout.
Switch, sink (greased) and resistors (greased) in place 
and wiring put in after lots of fussing to bend wires so they reached.
Not shown still, is thick plastic rectangle which presses resistors onto aluminum.
Switch is SPDT ON/ON 5 ampere toggle which works AOK for HF.

Later a meter and diode circuit will be added and adjusted 
to read 0-100 watts. (Half scale will be 25W, quarter scale 
will be 6 watts and lowest to be read).