Dave - interesting question!
My RGS has a replacement fusebox with LEDs. Can't recommend that - the contacts are ridiculously small, have no 'spring' and so don't grip the ATO fuses securely. I'm amazed they stay in place with vibration...probably thanks to the cover!
Arrangement shown uses a live bus connection too, so some jigging around with original wiring required. The whole thing is losing 1 volt of the 12 being supplied to it - useless. Am just about to replace it with the non-LED type shown - similar to Clem's photo. Has beefy full width contacts as Littlefuse intended with their original concept.
Can use standard wiring (make sure you get one that doesn't shroud the spade terminals otherwise your insulated spades won't fit). Only challenge is finding space for it...and getting the wires to reach!
All this means that staying with the original arrangement has something to recommend it - take the fuse cover off once in a while for a bit of preventative maintenance. Red RGS has more than 80k on it with no problems.
By way of an update - just spent the wet afternoon proving that a 4 way blade fusebox can be made to fit an RGS. (Don't try to make sense of the wiring - it's non-standard) Just needed to shave a bit of width off the plastic feet and drill new fixing holes.