As mentioned earlier, you can be really anal over some things and yet be ok with other things. Entirely up to you. Just about everything all fits together anyway so there shouldn't be any problems with running the motor how you've put it together.
Gearboxes for AC's would appear to come in 3 distinct specs depending on age.
The very early ones are EXTERNALLY exactly the same as the wartime motors. To spot the difference between a wartime and post war gearbox you'd have to separate it from the pump housing to see what that difference is. (impeller) These range from 46 up to around 48/49(ish as far as i've been able to work out).
2 nipples in the gearcasing (generally on the port side) and 1 in the straight out back pump housing (again port side).These are often found with a swept back 2 bladed prop. Quite sexy looking if you're into that sort of thing.
The next ones came in when the slightly uglier looking "sub ejector" pump housing was introduced. These have just 1 nipple in the gearcasing, no nipples in the pump housing and a different style of prop, the "bowtie" as we call it. I'm not 100% certain how long this version was in production for with just 1 nipple in the casing but i suspect it wasn't very long before the use of oil nipples was completely dropped from specs.There's some other slight changes elsewhere in the dna of a 102 for this time period, but there's still some work left for me to do in my data collection.
There might also be a few boxes around that i call "transitional" between the earlier and later pump housings that have 2 nipples in the gearcase but nothing up top, but as yet there's still gaps in my data that need filling which might help to answer a few unknowns.
The last ones in the range have no nipples anywhere, a completely different end cap this time because there's no provision for oiling as in the previous 2 versions, so there's now a filler/drain plug (normally brass and later on a bendy plastic or nylon) just like all the rest of the later gulls.
All 3 versions of gearboxes have 3 sets of 3 holes for the inlets, slotted inlets come along a bit later in the mid to late 50's (57 i think but i'm not entirely sure yet)
From what i've seen, the earlier boxes are polished (with holed inlets) and the later slotted inlet boxes seem to be painted. Same scenario with the props, early are polished and later are painted.
Fuel tanks change over the years as do the fixings to hold the tank to the engine block.
Earlier tanks were the bayonet type with corresponding fuel cap (quite scarce these days and sought after by many of us)
Later tanks have a screw type fixing for the cap, with these caps being aluminium. Again 2 different versions of ally caps to add to the confusion, small ears and big ears with wide and narrow slots to the vent (small/narrow early, big/wide later)
Bored yet?
Missing chrome seems to be quite a common thing with many older gulls these days. I have the same predicament with a lot of mine.
It has been said in the past that the chrome plating wasn't that great back in the day, and nowadays we face the same problems with finding a plating firm that can do the job reliably and not muck it up. At times i've had quotes from plater's that are eye wateringly expensive, so it's worth checking out a few before parting with any cash.
All well and good me just chatting about stuff, why not just show us a couple of pics of your 102.
We like pics on here, and it's a sneaky way for me to acquire a bit more data as well without boring the pants off you
Jon