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I belive i have this at home...i will take a photo and upload it for you

nice to see this car going! rare to see a uk member still building a 3g...will try answer a few of your questions! Ive gotta ask what driveshafts are you gonna run? Ive got hasport mounts etc but still deciding what to run..

Connect your brake booster to here (in green)...

However I'm really stuck on the wiring side of things. After researching about the wiring i've become more confused along with:

How do i wire this so it can run? it's an OBD2b engine and i have the entire loom from the donor car. Do i go OBD2 or can i modify the existing loom to make it run?

You can change out the whole interior and engine looms for obd2b looms but it will require knowing exactly what plugs are what and then wiring them to the original plugs from the 3g...an example would be knowing the hazard switch plug on the obd2b loom then wiring it to the hazard switch etc on the 3g...really long process but its doable...i know a lot of people convert the full car to obd1 etc....if it was me i would look into buying a rywire loom for ease (yet they are pricey)...

Alternator fitment

you need to put a dent in the frame/chassis rail to accommodate the alternator...i believe a shorter belt will help...will probably need the engine to come out to do this unfortunately...i think people run d16 alternators and change the plug as its a 3 rib not 4 which helps remove an extra 5mm or so to the dent

Which Radiator and fan to use along with how to mount them 

im just going to run a 4th gen or a single ally rad and just custom mount...gotta see how this fits first though! will let you know how i get on in the next couple of weeks!

Which Accelerator cable to use

still working this out myself...i will probably use a cable for the engine....so you could try to use a b16a2 from an ek at a guess...im going to use a teg one as thats my engine came from...

Do i modify the gearbox fork to fit or can i use another honda one

you could fit a cable gearbox from a b16a1 (4th gen civic or crx) to use the cable clutch etc but i would just buy the hasport hydro to cable actuator (again its just money)

Where does the brake booster pipe connect to and where can i mount the fuel sender unit

see photo above

For anyone interested, the UK Integra 86-89 D16 Hubs and bearings have the same part number as the Mk1 CRX D16 hubs and bearings...so I assume that instead of needing the integra knuckles/bearings/hubs for the Hasport shafts a Mk1 CRX could be used which may be easier to find in the UK...glad I didnt throw these hubs away now!

Basically the same knuckles. The same bearings. The only difference is the hubs themselves (spline count). I am running Civic knuckles with Integra hubs in new bearing in my swapped CRX

Sorry to bother you some more, but Im currently trying to look at my driveshaft options for my B18C6 swap in the UK. Ive seen the thread but was wondering if you knew the spline count of the integra hubs please. Only as I believe someone said I should use 3G civic 4WD Shafts as they are 22.75" but the spline count appears to be 26 for the outer CV's. I have Mk1 CRX D16ZC hubs and driveshafts which from all accounts seem to be 26 splines on the outer CV's. So im trying to save myself the hassle of buying the integra hubs and new bearings if I can use my CRX ones. I believe the 3G civic OEM ones are 23 splines.

Basically the same knuckles. The same bearings. The only difference is the hubs themselves (spline count). I am running Civic knuckles with Integra hubs in new bearing in my swapped CRX

so glad youve posted this...gonna save me a couple of hundred pound in the uk if this works...got spare set of 1G CRX knuckles im gonna try this with!