Ummm - solder? Are you sure that's a good thing? I would use screw terminals and multiple runs of solid wire, maybe high-guage magnet wire, crimped and press-fitted. The important thing is to keep parasitic resistance really low - you don't want the secondary effects of heating on any bits, and 10 amp switches may be a little under-specced for something like this.
Just because the current flowing through the switch is within its limits, doesn't mean the switch will work. I haven't been through all the linked threads - but you may have already heard, considered and factored this into your design.
I know you're already some way into the design, but active loads may be easier to design and control. Think of a constant current sink. Your voltages are really low so even low-voltage transistors like a 2N3055 will do fine, and there are better available. Use opamps in to control the base current, and enclose the load and input in a feedback loop - classical current output topology. Positive for source, negative for sink. The OPA549 power opamp can source or sink 8 amperes on its own, but is a little pricey for this kind of an application where you'd need quite a few of them. A power opamp with a transistor for multiplying current would be just perfect for something like this.
You will still need a small precision resistor (~0.05 ohm) in series with each transistor as the active 'load', but the transistor/s will enable you to sink a hundred watts each without problems. It may be cheaper as well, and reduce your dependence on the huge bank of expensive high-power resistors.
Just to clarify to the OP, this will not be within 10K INR, one way or the other. It's just not possible, you can get the resistors just fine, but switches, wire and construction are close to impossible in that budget range. Double that and we're talking.
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