The ball joints you have circled are part of the track arm and 'banana arm' and are not service items hence they are not listed by Toyota on their Electronic Parts Catalogue or EPC. There's been a lot of debate over the years on the various forums discussing whether someone could re-manufacture these parts. To date only the Polish guys are offering this and they don't sell the parts to do it yourself.
The overwhelming view of most experienced GT-Four owners is to buy these OEM parts from TCB. They often have them on special and this helps keep the price down. I picked up a set while they had a special offer on a couple of years ago as I'm sure to need them eventually! Personally, with something as critical as suspension I'd prefer to stick with Toyota parts for peace of mind. You don't want wheels falling off while blatting down the motorway
although this never seemed to bother Colin Chapman when designing Lotus sports cars!
Do you know how stiff you want to make your car? If it's your daily drive then do you really want super hard suspension? This can be quite difficult to live with due to the increase in noise, vibration and harshness. With my standard ST205 refurb I'm trying to keep everything stock with rubber bushes where possible. Some of these are no longer available so I'll use the next closest such as the Polybushes which Steve at
http://www.gt4-play.co.uk offers or the polybushes offered by the Poles at
http://www.gt4-racing.eu. I believe Martin Kingston at
https://www.mkautorepairsandtuning.uk/ stocks the Polish bushes so you might get them quicker from him.
If your car is only used for weekends and events, occasional track days etc. only then would I look at fitting polybushes all round. If you are mainly doing track work then I'd go with BRD's offerings. The bushes I have fitted on my track ST205 are very similar hardness (Shore value) to what Lou at BRD is now producing. We had built our track car subframes and suspension before BRD started offering bushes.
I'm also treating my refurbed standard ST205 subframes internally with Bilt Hamber Dynax S50 Cavity Wax
http://www.bilthamber.com/cavity-waxes/dynax-s50
I've found that one can of Dynax S50 will just about stretch to treat the front and rear subframes plus the North-South engine support member. I'll also be sealing the open holes in the subframes with plastic plugs to minimise the ingress of water.
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Fours are not cheap cars to fix so bearing in mind your circumstances if you take it slow and steady your plan sounds the best approach. I've been sourcing new bolts for the suspension in the last few weeks. Amazingly most of them still seem to be available, mostly out of Toyota's main European distribution centre in Brussels. Some have had to come from Japan. I do have a collection of bolts from a stripped ST205 so I've been busy matching them to the part numbers of the new bolts. Plan is to keep them as spares.
Presumably you are going to get everything media blasted, zinc primed and powdercoated? Given that you will have to remove the OEM rubber bushes what are your plans? You going to go full polybush with the subframe or stick with the OEM rubber bushes? Bear in mind that you can't get replacement OEM rubber diff carrier bushes so if you remove the old bushes you will have to go with either the Polybush or stiffer BRD replacement bushes. You can't get the OEM rubber bushes for the trailing or track control arms either so again it's a choice of Polybush or BRD bushes.
