Have you seen Interactive Service hub feature introduced in CRM 2016? You can configure custom entities to appear in your Interactive Service Hub UI:

During Entity creation, remember to tick this option:

During field creation, remember to tick this option if you want to have sorting and filtering for that field in Interactive Service hub:

Next, want to navigate to the Interactive Service hub. Now this can be done Via Sitemap itself.

Settings->Application ->Interactive Service Hub

It’s significantly faster to Load now in CRM 2016 Update 1!

Newly selected entity is available now:

Hope it helps and Happy CRMing!

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