Here is a picture of the spreadsheet
Do we need to keep the 42 zencash in the node now for reward or rewards will be after the secure node is implemented?
You should not have to keep the 42 Zencash on the node at all. And no rewards will start until the implementation. We are testing the tracking software now, you can follow progress in the ZenCash slack in #developers and #securenodes channels
Will the secure nodes require their own SSL certificate or will they be able to use the shared certificate from the server? If they require their own SSL, the economics of this are going to shift quite a bit with cost of static ip and certs.
each secure node needs their own certificate. You can use a free one from let'sencrypt
From my crypto layman's perspective, any verification should be built into each node, including protecting against bad info from compromised nodes.