no. no no no. no no. no. please no.
(i'm a bit biased in that a recent project had *amazingly* uncoordinated drawings provided by the KE supplier. they had conflicts of information between their cutsheets, drawings, schedules on sheet -- each listing different information for individual pieces of equipment. i've never seen anything so uncoordinated.)
from a workflow perspective what's grossly going to happen for projects with architects on them is this (where you're not just prepping an equipment remodel): architect sends you a base building model(possibly with a linked MEP and structural models), you link in their model(s) into your project file, you model stuff, send your model to the architect who links in your model and shares it with the engineers who link your model into their model.
you have 2 options here: you can use placeholder connections like i described (what you're asking for help on) or you can use the standard MEP connections that will connect to well modeled families, and MEP systems.
the first option you could build a custom family and schedules to look at instances, which gives you the advantage of being able to only have a couple of families, but will drive your architects and engineers nuts, and have them tell horror stories about you. this will be marginally easier for you, but actually give you less information unless you rebuild all of the behavior of the stock families from scratch. the MEP team will have to place stock families for each of the placeholders you placed.
with the second option, the engineers will copy/monitor your connections into their model and can just run with the information, not having to duplicate your work, and where they need changes, they can make them in their model or let you know to make the change. you'll be making everyone else's work easier. which means that instead of telling your clients to never use you again, they'll tell the clients you're useful, and helpful team players.
to not drive your architects and engineers nuts, *please* model everything *accurately* and use stock families for the MEP connections.
for your own sanity, build a starter project or template that is pretty thin. purge out everything you don't need. do NOT hold onto your old CAD graphical standards with a tight fist and "make it look right" by faking information or adding a horrible workflow to revit to match something. do match things, but if you can use a smart schedule, do that instead of a "dumb" one.
