AdamJ

I think I found an easy fix for this. Connect a Google Sheet to your newsletter block and then set up an email notification any time the sheet is updated.
In Squarespace > Edit Newsletter Block > Storage > Other Options > Connect Google Drive
In Google Sheet > click Help > type Edit Notifications > Choose notify me when any changes are made > Send email right away > Save

It is absolutely possible to link directly to a product detail page. It can be a text link, button, and etc.

link to product detail.mp4  

If you've created a second Blog page, you can move items from one blog to the other as follows:
In the Home Menu, click Pages. In the Pages panel, select the page containing the content you're moving. Press and hold Shift and click the item or items you want to move. In the action bar at the bottom of the panel, click Move. The Move button only shows if you have at least one other pageof the same type. In the Select Destination Collection window, select the page where the content will go. Click Move Items. The select and move options might look different depending on the page type. For more information see: Moving collection items between pages.

You cannot password protect an individual post or provide a contributor account with this level of granularity. However, there is a workaround.
First create a second, empty blog page and set a password on this blog.  Next, move the draft post to the new, password-protected blog and publish it there. Finally, share the blog password and the URL of the post with the author to allow them to view it. Did this help? Please give feedback by clicking an icon below  ⬇️

Hi @AdamJ 
So pleased it was helpful!
Re. your mockup — totally possible, you can add a product block to a section above your products on the store page. 
P.S. I've been updating my own site today and know how much of a pain it can be to go back and forth on changes! If you'd like help with it I can clean up and simplify a lot of your site in a couple of hours.
— Hannah
Studio Founded

Hi @AdamJ
It is quite text heavy, but I think some design tweaks would help.
Home
Overall, I would add more white space to give the design more breathing room. Remove the text overlay on the rotating image in the header section. It's busy and moves too quickly to easily be read. The second section (plans, numbers, images, etc.) could be broken into two rows (a 3x2 grid). Six steps within the "how it works" section feels overwhelming. Could you reduce the content to 3-4 steps? There are some gaps in the Case Studies section between the paragraph text and button.  The header CTA totally depends on your main offer. Are products your primary offer, or do you want clients to book a call to discuss a project?  About
Break this information into two sections so the text feels less blocky. The first section could be more about the brand and what you offer, and the second section could be about the founders and people behind the brand. FAQ
I would reduce the text size a little. Blog
The posts and text feel quite close together. Can you add a little more white space? Products
I am a little confused about your offer. If you had 1-3 products, using a store to sell services would be more user-friendly, but with so many products it's a little confusing what to buy, when to buy it, and how the process works.
I think I would encourage customers to reach out to you so you can discuss options with them and send an invoice for the core product + add ons. 
If you don't want to invoice them, you can set up the store with just your core offer. After they purchase your core offer, you can redirect them to a hidden store page with the add-on products (tutorial here). 
Let me know if this all makes sense!
— Hannah
Studio Founded

I'm not a circler, but I find things like the colour changing banner at the top and the white glow that follows the cursor around at the bottom of the home page distracting. It looks like the logo has been designed for a white background, and a lot of the detail in that image, (like the wood grain in the tree stump) doesn't show up well against a colour background - it definitely looks its best on the contact page. 

Thank you to whoever moved my post into this thread - I can see that Paul2009's link is an answer to my question too. 

Squarespace doesn't have this feature. There's a third party workaround in the form of the Squarewebsites Uploader but the file won't arrive with the order - it will be saved elsewhere to allow you to access it.
Did this help? Please give feedback by clicking an icon below  ⬇️