i did onoe of those not too long ago
used all civic mounts with a rear gsr bracket in a 97 hx. was pretty easy just went ahead and used a civic ex harness though since i did not want to tangle with the 5 wire o2 sensor and the egr wiring.
the onyl weird thing is the hx seems to use a smaller compressor for the a.c compared to ther civics...so the del sol/si a/c bracket did not fit perfect, but it did work