Opinion on Elekit 8300 300b

I am thinking of building this kit. I would like to get into SET's and expand my DIY. Currently have Green Mountain EOS HDx's with Ayre QB9 and Ayre AX7e. The GMA's are only 90dB but a very simple xover and easy to drive.

I tried a MiniWatt Pentode SET with 3.5 watts and it sounded very nice for guitar, voice and violin. The 300b kit has 8 watts and would be sufficient for the kind of listening I intend to do with it. I will def keep my Ayre for R&R, dub step etc.

I have built computers (in the old days) and soldered chips so I know how to solder and know digital well. Just am not so familiar with analog stuff and power.

I am interested in trying lots of mods over time so may be investing money in it.

Questions are:

1. Is it worth the money as a starter kit?
2. Is it an upgradeable platform or does the use of PCB's negate that?
3. Would I be better off using a wired platform from the start?
4. Anyone know about the Elekit kit that has interchangeable 2a3 and 300b? Sounds interesting but maybe the tradesoffs are too great.

I know about Audionote and Bottlehead but these kits really almost double the cost and I would prefer to try different mods and upgrades. Also want to build a set of Single driver speakers soon too.

Thanks for you opinions! Oh, really not trying to stir a debate about tubes vs SS. I like em both really and want both of them in my audio quiver!

Drew.