You really should have an idea what you are doing before you attempt to complete an 80%. This isn't a flame, but some of the errors were on your part.
1. If you got a lower with that looked bad, you either ordered a #2 or #3 grade, or you were shipped a lower grade in error. In any case, you should have contacted TS for exchange or refund. They are very good about doing that.
2. If you received one with the enclosed trigger guard, either you ordered it or they shipped the wrong lower to you. The 'Enhanced Version' is an additional $15 and has the enclosed trigger guard, which a number of people specifically requested be manufactured. See #1 for what you should have done.
3. There is plenty of room to remove the solid trigger guard. Take another look at the photos posted. [url]http://www.tanneryshop.com/PRODUCTS.html[/url] About 3/4 down the page, the roll over photos show both versions. The tabs for making the cuts are visible.
4. Preanodized lowers don't make much sense to me, but others may have a use for them. If you want a nicely finished and smooth lower, you have to work on it with files and sandpaper. Doing this on a preanodized lower just strips off the anodization and it will have to be done again. If you don't smooth out the lower, you won't need to re-anodize, but you are left with casting marks and small air bubbles.
5. Aluminum is soft. There is no strength required in a lower. It doesn't require the strength to handle any pressure or force as none is exerted on it. This is what makes it an easy project for home builders.
6. I don't know if the lowers are sandblasted, but by their appearance I would guess that they are. See #4.
I've finished a TS Grade #1 lower, and have a Grade #2 lower that I'll work on in the future. The Grade #2 has casting marks and more numerous air bubbles, but most of it will clean up with filing/sanding. The #1 I finished cleaned up very nicely and with the home anodizing and finishing, it looks pretty good. Not the quality finish as BM, RRA or any of the others, but very acceptable.
The reasons for completing a lower has nothing to do with money. They are NEVER cheaper than purchasing them complete, as you have found out. If you went into this figuring you would save a few bucks, as you've seen, it ain't gonna happen. The reasons people complete these, and why there is such a market (and growing rapidly) is:
A. For Do-it-yourselfers, it a sense of accomplishment, being able to do what few others can (or will).
B. No FFL or Federal Paperwork involved. No serial number required, no registration (state laws may vary).
It took me months of visiting sites and gathering information before I started. If you are interested in this type stuff, a visit to the [url]www.roderuscustom.tzo.com[/url] forums will provide you with more information than you could use.
As for the quality of the TS products, their products and support are top notch. You will find a lot more people who disagree with your experience than who will support it. Too bad you crushed your lowers. At one time William was buying them back from people who had ruined them ($40/ea, I think). He'd use them to make more guns for himself. (I don't know if he is still doing this).