I'm sorry. I must have clicked on the pm notification while half asleep and completely forgot afterwards.
Regarding the price, its pretty much what you would have paid here if you ever found the kappa series and they were new. Also, the 1260 alone sells for over 10k.
Connecting all of these is a piece of cake tbh. What matters more is the fitment. There are a few ways you can go ahead and do the install.
Get one 4 channel amp: Connect the front comps from channel 1/2 and the sub bridged from channel 3/4. You will need to run the rear coaxials from the pre.
Get one 5 channel amp: Connect the front comps from channel 1/2, the rear coaxials from channel 3/4 and the sub from channel 5.
Get one 4 channel amp and one Mono amp: Run the components and rear coaxials from the 4 channel amp and the sub from the mono amp.
It really depends on your next budget set for the amplification. The digital amps from pioneer for example are small (so they don't take up space) and powerful plus they cost between 15k-20k. You might find better prices too. Then ofcourse, you can opt for the more sq oriented old school amps from zapco, addzest, mcintosh etc. You can find some in great nick and great prices too but mind you, most of them are the size of a pillow. OR the newer versions which usually end up costing you an arm and a leg.
There are some great amps for sale on pw so you might want to have a look at these.
About the sub, the preferred range of volume for a sealed box is 1-1.25 cu/ft. I've seen people go with slightly smaller/bigger sizes too but I've heard subs in a 1.25 box and I have my JL in a 1 cu/ft box and I am as happy as the next person would be. The box is filled up/lined with polyfill which in laymen's tearms, reduces the boominess (if that's even a word) by tricking the sub into thinking the internal volume is larger than the original.
If you are in pakistan before the 20th of feb, i'll drop by to help you. I'm leaving after that but remember, the fun is all in collecting the stuff itself.
Best of luck.