This varies a lot by latitude and things like the competence of your construction firm, but, for example, https://seia.org/research-resources/solar-market-insight-rep... gives cost breakdowns for the average US “turnkey installed price” of solar power at the time, coming in at 98¢ per (peak) watt for “utility-scale fixed-tilt”, of which about 40¢ is the PV module itself. So, at least at that time, in the US, 41% of the cost was the panels, not 25%. So I don't think my estimate of 33⅓% was as "wildly off" as you do.

That might have changed if cost reductions in other parts of solar power plants have lagged behind cost reductions in the panels. But actually mainstream PV modules cost exactly the same today as they did in Q2 of 02024 (https://www.solarserver.de/photovoltaik-preis-pv-modul-preis...), which is when the report is about, so, if anything, we'd expect to see them taking up a larger fraction of the total cost, since the other components presumably have gotten cheaper as they've moved down the learning curve. (The "low-cost" and "high-efficiency" categories did get cheaper, but, as I understand it, the former are not generally used for utility-scale plants.)

The connection to the grid is a question of politics, not cost and resources.