Frustum, Step-Box and Chimney?

When you do not understand a concept it is usually better to provide more information than less for a good clarification. Packing all of your uncertainties into one sentence is grammatically correct but it does not provide enough clues for a clear identification of the terms.

"Frustum, stepbox, chimney" are different three dimensional shapes. "RCC" is an undefined acronym also known as jargon that could identify a two pole passive filter topology or it could just be a company name. (RCC happens to be the initials of my late father, too.) Formboxes seems to be a self evident word mash up, typographic error of two words that should be separated by a space. Now how moderately coarse 40 mm aggregate stone(?) often used to make a structural foundation apples to this collective conundrum is anybodies guess.

Eschew obfuscation.

This might help....

"In geometry, a frustum^[1] (plural: frusta or frustums) is the portion of a solid (normally a cone or pyramid) that lies between two parallel planes cutting it. A right frustum is a parallel truncation of a right pyramid.^[1]"

http://en.wikipedia.org/wiki/Frustum

Reinforced concrete chimney...

http://www.performancepanels.com/concrete-form-panels

http://payyavoorcrushers.com/products.php

http://www.slideshare.net/atulkumarengineer/is4562000

Why bother with details for making cost estimates? Just add 50% as "I dont know what else it could be charge".

This would be the envelope you later can put all costs in that emerge due to "nobody having a clue out of pocket expenses on the job". Customers are not that fuzzy they will pay it - unless they have a clue.

My advice: be smarter than the rest of us and also than your client. Only that pays in the long run.

All these relate to the creation of suitable foundations for your transmission towers or poles.

Talk to other people and get a range of prices on an average of $X per Metre for your area of the world.