What would you suggest we do to further the catacombs cause?
That's a tricky one.
Should we intentionally not try to improve our chapels so that we keep some element of humility? On the other hand, we should have some things -- maybe just a few -- that are extravagant to show our respect for the Blessed Sacrament.
Anyhow, I think for starters we should not compromise on doctrine, or be tempted to "go along to get along" just so we can partake of these massive Trad establishments that "have everything". If we are too attached to these "real churches" we will despise small groups like the Resistance which offer the Truth, holy priests, but unfortunately can't offer too many amenities in the aesthetics department.
On Holy Thursday the organ went silent after the Gloria (as it should -- this is liturgically required) and I was admiring how beautiful it was to hear the congregation singing the other parts (Sanctus, Agnus Dei) acapella. I think that might help to illustrate my point.
Actually, the chapel I've set up has an electronic organ (a pretty large one).
Anyhow, the goal should be: to be dignified, beautiful, worthy of the Blessed Sacrament. But every single thing in the chapel NEED NOT BE GLAMOROUS or expensive. Think: monastic cell. Clean, spartan, with a few holy pictures and things to raise our minds upwards (we're not iconoclasts), but incredibly conducive to prayer.
Sometimes less is more.
But the real issue is: we're at war. When at war, you don't try to bring ALL the comforts of home with you. Sure, you have a certain minimum of facilities, but none of them are as deluxe as what you have back at home when you're not fighting the enemy.
2 humble chapels for $10,000 each is better than 1 nicer $20,000 chapel. It's about reaching and benefiting the most souls, it's about the Faith, and by extension it's about the Mass. Having the nicest chapel to woo the superficial "smells and bells" people away from their precious Indult? Who cares. Those people will come to a humble chapel if they are truly interested in the full package of Truth (opposing Vatican II freely, etc.) If it takes an expensive chapel to convince them to switch -- you're not getting a high quality parishioner. It's as simple as that.
Now apply this to the new seminary in Virginia. See why it's a bad idea? It's the exact opposite of what they should be doing, if they had the right mindset.