On the price of the hull, I personally know four members of this site that got their 20' SeaCraft hull for under $1,000. While this was unfortunately not my situation, deals are out there and I tend to see them more often recently than I used to. There have been some pretty good deals on 23's on this site in the past year as well.
Some of the items on your list cost what they cost without a lot of variation in price (engine, trim tabs, etc) but other parts of the list can vary widely in price which makes a "ball park figure" somewhat sketchy. On the center console, wiring, fuel tank, leaning post, and trailer, you can have wide swings in price based on how nice you want to go. As such, a ball park price on those items would be quite a range.
You can get a pre-made tank that will fit somewhere in your boat for fairly cheap or you can get a custom tank to your exact dimensions that will cost more.
An off-the-shelf center console can be had for $200 or you can spend upwards of $2K.
I've seen serviceable leaning posts (new) for sale for $200 and there are those with all the trimmings that cost nearly $1,200.
Do you want a single axle galvanized trailer (maybe purchased used to save $) or do you want a tandem aluminum trailer with stainless disc brakes? You can get the former for under $1,000 and the latter for over $3,000.
Only you know what kind of finished project suits you and how nice you want it to be. The fish you are trying to catch won't know the difference between a $10,000 and $40,000 boat
