Ive been in discussion regarding this RP-500m kit now with a couple different people. I'm working on some physical layout drawings for this model today. The challenge is there are two fairly large capacitors and two inductors all on the woofer circuit. The good part is there is plenty of room inside the cabinet, the internal bracing is not overly impeding, and the woofer opening over 4" diameter is plenty even for the largest of the components. End result is this is likely going to require that the tweeter and woofer circuits are separated into two separate boards. One will mount to a side wall, the second will mount either on opposite side wall or on floor of cabinet.
I'm not giving up on ability to put it all on one board, on side wall, but it will require some component stacking such as placing one of the large woofer capacitors on top of the layed down inductor, and everything else will have to be very well organized and condensed on hopefully a 4"x10" board.
I'd say in comparison with other kits, this is only a medium difficulty. It will require some careful layout planning but definitely not something that i'd say would require a buyer warning due to difficulty.
Personally, I'm very much a fan of the RP-500m and RP-600m and think that as long as you are buying the speakers at sale price, that even with the added cost of upgrades, they are both worthwhile purchases.
I'll have a layout worked out for those couple people that have reached out. For anyone else looking for help with other assemblies or layouts, feel free to reach out to me directly.
Elon
Ezeecrossovers@gmail.com