People have boosted stock engines with interesting/impressive results, others have catastrophe. In those seemingly successful cases, tuning is essential for longevity, but even then the best tuning can only go so far. As for wiring, ECU modifications are mandatory to successfully pulling off turbocharging a non-turbocharged engine, there is very little in the way of getting around that reality. There are a few ways to approach this, you should read more on this subject to pick the one that works for you.
What area of the USA are you in? In most places, cars newer than 1996 are OBD2 and subject to emissions testing. The fact that its OBD1 swapped and you haven't seemed to have any issues getting it legal is interesting!
If it's OBD1 it is definitely on the most common electrical architecture for turbocharging a Honda where there is very good aftermarket support to support you. You speak of an interesting ECU though, I'm not familiar enough with what you are describing to say much more. Pictures might help! If it's an odd ECU for some reason, replacement of the ECU may be a reality to support the required mods.
Just know this, the cost of a "turbo kit" in the most basic of sense is only about a 1/3 to 1/5th of the total usually required to get things working reliably. I don't know enough about those bottom ends to recommend pistons/rods/rod and main bearings, etc. but I'm sure someone with experience using those engines will chime in shortly!
It's the essentials that go beyond basic engine mechanical hardware are what get you: tuning solution, getting it tuned, upgrades to fuel system like injectors/pump/regulator, increased heat output needing to beef up the cooling system, any custom fab work needed to facilitate the mods, a wideband setup, gauges, etc. the list goes on.
It's definitely possible, the end results are very rewarding and the group of guys doing these mods are like minded folk.
I will close with this: just take this from someone who had a budget of around 3-4 grand getting my build up and running, I blew through that and about tripled it. My latest build happened over the course of about 3 years, as most who do these builds are also real world people with jobs/wives/kids/other priorities (let's face it, we are working on Honda's lol the go-to A to B mobile!). Most of the higher expenses were shop equipment based, as I looked at things from one perspective: get someone else to spend XX hours at like $100-150 an hour to build/do certain things for me OR I buy all the equipment and materials needed to do things myself.
Another thing to keep in mind is that these things do take time. If you need the car in a practical sense as a backup that must be reliable, then you might want to buy another beater before modding your civic. It will be down for extended periods if you do decide to turbo, you can almost bet on it
